A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
 
  Gemstone Mohs Hardness Scale   Possible Enhancements Purpose of Enhancement Frequency   stability care and handling   code
Gemstone A - B                    
  Alexandrite  8.5   none n/a n/a   n/a Normal Care    
  Alexandrite - Narsipatnam   8.5   none n/a n/a   n/a Normal Care   n/a
  Alexite  5.5   none n/a n/a   n/a Avoid harsh chemicals, steam and ultrasonic cleaners. Avoid sudden temperature changes   n/a
  Amazonite - Russian   6 - 6.5   none n/a n/a   n/a Avoid heat, chemicals, and ultrasonic cleaners   n/a
  Amber - Baltic  2 - 2.5   none n/a n/a   n/a Amber is very soft, so be mindful of scratching. Avoid harsh chemicals and ultrasonic cleaners   n/a
  Amber - Baltic  2 - 2.5   heated to improve appearance, deepen color, and add "sun spangles" usually   good to very good Amber is very soft, so be mindful of scratching. Avoid harsh chemicals and ultrasonic cleaners   H
  Amber - Baltic  2 - 2.5   heated with oils under pressure to alter color usually   good to very good Amber is very soft, so be mindful of scratching. Avoid harsh chemicals and ultrasonic cleaners   HPHT, O
  Amber - Baltic  2 - 2.5   dyed/stained to alter color rarely   variable Avoid repolishing. Amber is very soft, so be mindful of scratching. Avoid harsh chemicals and ultrasonic cleaners   D
  Amber - Mayan Green   2 - 2.5   heated to alter color commonly     Amber is very soft, so be mindful of scratching. Avoid harsh chemicals and ultrasonic cleaners   H
  Amethyst - African 7   heated to improve color rarely   excellent Normal Care   H
  Amethyst - Bahia 7   none n/a n/a   Very Good Amethyst may fade with long exposure to direct, bright sunlight.   n/a
  Amethyst - Bolivian 7   heated to improve color rarely   excellent Normal Care   H
  Amethyst - Green 7   heated to improve color rarely   excellent Normal Care   H
  Amethyst - Lusaka   7   heated to improve color rarely   excellent Normal Care   H
  Amethyst - Pink 7   heated to improve color rarely   excellent Normal Care   H
  Amethyst - Rose De France   7   heated to improve color occasionally   excellent Avoid heat. Certain stones may fade in daylight.   H
  Amethyst - Uruguayan   7   heated Improve Color Commonly   Excellent Avoid harsh chemicals, steam and ultrasonic cleaners. Avoid sudden temperature changes   H
  Amethyst - Zambian 7   heated to improve color rarely   excellent Normal Care   H
  Ametrine - Anahi 7   heated to improve color uniformity always   n/a Normal Care   H
  Ammolite - Canadian 3.4- 4   Impregnated, Assembled Improve Color and Stability Commonly   fair - good Avoid harsh chemicals, steam and ultrasonic cleaners.   I, ASBL
  Andalusite - Jenipapo   7 - 7.5   none n/a n/a   n/a Normal Care   n/a
  Andesine - Red  6 - 6.5   Diffused To create color Always   Very good Normal Care. Avoid heat, chemicals, ultrasonic and steam cleaners.   DF
  Angelite - Mexican 3 - 3.5   no treatment n/a n/a   fair Avoid harsh usage   n/a
  Apatite 5   Heated To improve color Always   Very Good Apatite is moderately soft, so be mindful of scratching. Avoid heat, harsh chemicals, and ultrasonic cleaners.   H
  Apatite - Blue 5   Heated To improve color Always   Very Good Apatite is moderately soft, so be mindful of scratching. Avoid heat, harsh chemicals, and ultrasonic cleaners.   H
  Apatite - Canary Yellow 5   Natural  N/a n/a   good Apatite is moderately soft, so be mindful of scratching. Avoid heat, harsh chemicals, and ultrasonic cleaners.    
  Apatite - Cat's Eye 5   None  N/a Rarely   n/a Apatite is moderately soft, so be mindful of scratching. Avoid heat, harsh chemicals, and ultrasonic cleaners.    
  Apatite - Forte Dauphine 5   Heated to add color always   very good   Normal Care. Avoid heat, chemicals, ultrasonic and steam cleaners.   n/a
  Apatite - Emerald Green 5   Heated To improve color Always   Very Good Apatite is moderately soft, so be mindful of scratching. Avoid heat, harsh chemicals, and ultrasonic cleaners.   H
  Apatite - Indian Ocean   5   Heated To improve color Always   Very Good Apatite is moderately soft, so be mindful of scratching. Avoid heat, harsh chemicals, and ultrasonic cleaners.   H
  Apatite - Madagascar   5   none n/a rarely   n/a Apatite is moderately soft, so be mindful of scratching. Avoid heat, harsh chemicals, and ultrasonic cleaners.   n/a
  Apatite - Madagascar   5   heated to improve color usually   good Apatite is moderately soft, so be mindful of scratching. Avoid heat, harsh chemicals, and ultrasonic cleaners.   H
  Apatite - Natural Green   5   none n/a rarely   n/a Apatite is moderately soft, so be mindful of scratching. Avoid heat, harsh chemicals, and ultrasonic cleaners.   n/a
  Apatite - Neon 5   none n/a rarely   n/a Apatite is moderately soft, so be mindful of scratching. Avoid heat, harsh chemicals, and ultrasonic cleaners.    
  Apatite - Paraibe 5   Heated To improve color Always   Very Good Apatite is moderately soft, so be mindful of scratching. Avoid heat, harsh chemicals, and ultrasonic cleaners.   H
  Apatite - Yellow 5   Natural  N/a n/a   good Apatite is moderately soft, so be mindful of scratching. Avoid heat, harsh chemicals, and ultrasonic cleaners.    
  Aquamarine - Espirito Santo   7.5 - 8   heated to improve color usually   excellent Normal Care   H
  Aragonite  - Cantonese Blue  3.5 - 4   none n/a n/a   n/a Aragonite is soft, so be mindful of scratching. Avoid heat, harsh chemicals, and ultrasonic cleaners. Aragonite is generally unsuitable for jewelry.   n/a
  Azurite  - Aurora 3.5 - 4   none n/a n/a   n/a Normal Care   n/a
Gemstone C                    
  Calsilica - Rainbow   3.0-4.0   Composite to enhance the appearance commonly   good     n/a
  Ceruliete 5 – 6   none n/a n/a   n/a Normal Care    
  Charoite - Siberian   4.5-5   none n/a n/a   n/a Charoite is somewhat sensitive to heat and pressure, so avoid the use of steam cleaners and ultrasonic cleaners, as well as any prolonged exposure to direct sun light.   n/a
  Chrysocolla 2.0-4.0   Iimpregenation to improve appearance and stability Usually   Very Good Avoid scratching, ultrasonic cleaners, harsh household chemicals, prolonged exposure to direct sunlight and excessive heat   I
  Chrysocolla - Parrot Wing 2.0-4.0   Iimpregenation to improve appearance and stability Usually   Very Good Avoid scratching, ultrasonic cleaners, harsh household chemicals, prolonged exposure to direct sunlight and excessive heat   I
  Chrysotile 5   none n/a n/a   n/a normal care   n/a
  Chrysoprase  - Australian 6 - 7   none n/a n/a   n/a Normal Care   n/a
  Citrine - Brazilian 7   irradiated to create color unknown   excellent Normal Care   IR
  Citrine - Brazilian  7   heated to alter color usually   excellent Normal Care   H
  Citrine - Madeira 7   heated to alter color usually   excellent Normal Care   H
  Citrine - Santa Anna Madeira   7   heated to alter color usually   excellent Normal Care   H
  Citrine - Santa Anna Madeira   7   irradiated to create color unknown   excellent Normal Care   IR
  Coral - Angel Skin Mediterranean  3 - 4   none n/a n/a   n/a Avoid scratching, temperature changes, steaming, chemicals, and ultrasonic cleaners.    
  Coral - Mediterranean Natural  3 - 4   none n/a n/a   n/a Avoid scratching, temperature changes, steaming, chemicals, and ultrasonic cleaners.   n/a
Gemstone D                    
  Diamond  10   Natural NA NA   good Normal Care   NA
  Diamond - Champagne 10   N/A N/A N/A   N/A Normal Care. Avoid heat, chemicals, ultrasonic and steam cleaners.   n/a
  Diamond - Pink  10   None N/A N/A   N/A Normal Care. Avoid heat, chemicals, ultrasonic and steam cleaners.   N/A
  Diamond - Canary Yellow  10   Natural NA NA   good Normal Care   NA
  Diamond - Red   10   irradiated to create color occasionally   excellent to very good Normal Care   IR
  Diamond - Black   10   irradiated / heated to create color and improve clarity commonly   fair to good Avoid heat, harsh chemicals, and ultrasonic cleaners   IR H
  Diamond - Blue   10   irradiated to create color occasionally   excellent to very good Normal Care   IR
  Diamond - Yellow   10   irradiated to create color occasionally   excellent to very good Normal Care   IR
  Diamond - Green   10   irradiated to create color occasionally   excellent to very good Normal Care   IR
  Diamond - Purple   10   irradiated to create color occasionally   excellent to very good Normal Care   IR
  Diopside - Indian Black Star   5 - 6   none n/a n/a   n/a Diopside is moderately soft, so be mindful of scratching. Avoid sudden temperature changes and harsh chemicals.   n/a
  Diopside - Russian   5 - 6   none n/a n/a   n/a Diopside is moderately soft, so be mindful of scratching. Avoid sudden temperature changes and harsh chemicals.   n/a
  Dino Bone 6.5 to 7   Stabilized Improve Durability Always   Fair Avoid harsh chemicals, steam and ultrasonic cleaners. Avoid sudden temperature changes   S
Gemstone E                    
  Emerald 7.5-8   None n/a n/a   n/a Normal Care and Handling   n/a
  Emerald - Boyaca Colombian  7.5-8   None n/a n/a   n/a Normal Care and Handling   n/a
  Emerald - Boyaca Colombian 7.5-8   oiled/resin infused to improve clarity Rarely   Fair Avoid heat, harsh chemicals, and ultrasonic cleaners   0
  Emerald - Boyaca Colombian 7.5 - 8   Filled Improve Appearance and Clarity Commonly   Variable Normal Care and Handling   F
  Emerald - Boyaca Columbian 7.5-8   Dyed Improve Color rarely   Fair Avoid harsh chemicals, steam and ultrasonic cleaners. Avoid sudden temperature changes   D
  Emerald - Kagem Zambian 7.5 - 8   Filled Improve Appearance and Clarity Commonly   Variable Normal Care and Handling   F
  Emerald - Kagem Zambian  7.5 - 8   Oiled/Resin Infused Improve Appearance and Stability Always   Fair Avoid harsh chemicals, steam and ultrasonic cleaners. Avoid sudden temperature changes   O
  Eudialyte - Russian   5 - 5.5   none n/a n/a   n/a Normal Care   n/a
Gemstone F                    
  Feldspar - Black   6.5   None n/a n/a   n/a Normal Care   IR
  Fluorite - Belgian Teal  4   Irradiated to create color usually   fair to good Avoid scratching, temperature changes, steaming, chemicals, and ultrasonic cleaners.   IR
  Fluorite - Canary Yellow  4   None n/a n/a   n/a Avoid sudden temperature changes, steaming, chemicals and ultrasonic   n/a
  Fluorite - Chinese Blue   4   None n/a n/a   n/a Avoid sudden temperature changes, steaming, chemicals and ultrasonic   n/a
  Fluorite - Color Changing 4   None n/a n/a   n/a Avoid sudden temperature changes, steaming, chemicals and ultrasonic   n/a
  Fluorite - Mint Green   4   None n/a n/a   n/a Avoid sudden temperature changes, steaming, chemicals and ultrasonic   n/a
Gemstone G                    
  Garnet - Ambanja Demantoid 6.5 - 7   none n/a n/a   n/a Normal Care   n/a
  Garnet - Anthill 6.5 - 7   none n/a n/a   n/a Normal Care   n/a
  Garnet - Brazilian Mint 7 - 7.5   None N/A N/A   N/A Normal Care. Avoid heat, chemicals, ultrasonic and steam cleaners.   n/a
  Garnet  - Bekily Color Change  7 - 7.5   none n/a n/a   n/a Normal Care   n/a
  Garnet - Brazil Red 7 - 7.5   none n/a n/a   n/a Normal Care   n/a
  Garnet - Karo Tsavorite   7 - 7.5   none n/a n/a   n/a Normal Care, Avoid sudden temperature changes.   n/a
  Garnet - Orissa Rhodolite   7 - 7.5   none n/a n/a   n/a Normal Care   n/a
  Garnet - Malaya 7 - 7.5   none n/a n/a   n/a Normal Care    
  Garnet - Mozambique 7 - 7.5   none n/a n/a   n/a Normal Care   n/a
  Garnet - Musi River Garnet 7 - 7.5   none n/a n/a   n/a Normal Care    
  Garnet - Pyrope 7 - 7.5   none n/a n/a   n/a Normal Care    
  Garnet - Ratnapura Hessonite   7 - 7.5   none n/a n/a   n/a Normal Care   n/a
  Garnet - Red good to know   none n/a n/a   n/a Normal Care   n/a
  Garnet - Spessartite   7 - 7.5   none n/a n/a   n/a Normal care   n/a
  Garnet - Mahenge Umbalite 7 – 8   None n/a n/a   n/a Normal Care  
  Garnet - Viceroy Spessartite   7 - 7.5   none n/a n/a   n/a Normal care   n/a
  Goshenite - Brazilian 7.5 to 8   None N/A N/A   N/A Normal Care. Avoid heat, chemicals, ultrasonic and steam cleaners.   n/a
Gemstone H                    
  Helenite 5   Artificial glass made from Ash of Mt Helens n/a n/a   n/a Normal Care   n/a
  Helenite - Champagne 5   Artificial glass made from Ash of Mt Helens n/a n/a   n/a Normal Care   n/a
  Helenite - Purple 5   Artificial glass made from Ash of Mt Helens n/a n/a   n/a Normal Care   n/a
Gemstone I                    
  Indicolite - Monte Belo   7 - 7.5   None n/a n/a   n/a NormaNormal Care and Handling l Care   n/a
  Indicolite - Monte Belo   7-7.5   heated to improve color rarely   excellent normal care   H
  Iolite - Catalina   7 - 7.5   none n/a n/a   n/a Normal Care and handling.   n/a
Gemstone J                    
  Jade - Burmese 6.5 - 7   Bleaching, Dyeing, Impregnation Improve color, create color, increase durability Always   Very good Normal Care. Avoid heat, chemicals, ultrasonic and steam cleaners.   B, D, I
  Jade - Chinese 6.5 - 7   Waxing, Dyeing Improve color Always   Very good Normal Care. Avoid heat, chemicals, ultrasonic and steam cleaners.   W, D
  Jasper 6.5 -7   resin coated n/a n/a   n/a n/a    
  Jasper - Australian Pibara 6.5 -7   resin coated n/a n/a   n/a n/a    
  Jasper - Blood 6.5 -7   resin coated n/a n/a   n/a n/a    
  Jasper - Bumble Bee  6.5 - 7   resin coated n/a n/a   n/a n/a   n/a
  Jasper - Indian Script Stone 6.5 - 7   None n/a n/a   Good Avoid sudden temperature changes, steaming, chemicals and ultrasonic   n/a
  Jasper - Mayan Porcelain  7   none n/a n/a   n/a Normal Care   n/a
  Jasper - Mexican Porcelain 7   none n/a n/a   n/a Normal Care    
  Jasper - Peanut Wood  7   none n/a n/a   n/a Normal Care   n/a
  Jasper - Picture 6.5 -7   resin coated n/a n/a   n/a n/a    
  Jasper - Porcelain 7   none n/a n/a   n/a Normal Care    
  Jasper - Rainforest   7   none n/a n/a   n/a Normal Care   n/a
  Jasper - Utah Rhyolite 6.5 - 7   resin coated n/a n/a   n/a n/a    
  Jasper - Venus 6.5 -7   resin coated n/a n/a   n/a n/a    
Gemstone K                    
  Kyanite - Green   4 - 7   none n/a n/a   n/a Avoid rough handling, temperature changes, chemicals, steaming, and ultrasonic cleaners.   n/a
  Kyanite - Himalayan   4 - 7   none n/a n/a   n/a Avoid rough handling, temperature changes, chemicals, steaming, and ultrasonic cleaners.   n/a
  Kyanite - Teal   4 - 7   none n/a n/a   n/a Avoid rough handling, temperature changes, chemicals, steaming, and ultrasonic cleaners.   n/a
  Kunzite 6.5 to 7.0   Heated To improve color and remove brownish tones commonly   good Avoid prolonged exposure to strong light and harsh usage   H
  Kunzite - Xia 6.5 to 7   None N/A N/A   N/A Normal Care. Avoid heat, chemicals, ultrasonic and steam cleaners.   n/a
Gemstone L                    
  Labradorite - Malagasy   6 - 6.5   none n/a n/a   n/a Normal Care   n/a
  Labradorite - Finland Spectrolite   6 - 6.5   none n/a n/a   n/a Normal Care   n/a
  Lapis Lazuli - Afghan 5.0-5.5   None n/a n/a   n/a Normal, gentle handling. Avoid exposure to acids, heat and ultrasonic cleaners.   n/a
  Larimar 4.5 - 5   none n/a n/a   n/a Normal Care   n/a
  Larimar - Nautral Green 4.5 - 5   none n/a n/a   n/a Normal Care   n/a
  Lepidolite 2.5 - 3   none n/a n/a   n/a Avoid exposure to high temperature and harsh household chemicals.    
Gemstone M                    
  Magnesite 3.5 to 4.5   dying; impregnation to improve color; to improve durability Always   Very Good Normal Care. Avoid heat, chemicals, ultrasonic and steam cleaners.   D; I
  Malachite - African 3.5 - 4   coated with colorless wax to improve appearance occasionally   fair Malachite is soft, so be mindful of scratching. Avoid chemicals and ultrasonic cleaners.   C, W
  Malachite - African 3.5 - 4   dyed to improve color uniformity occasionally   good Avoid chemicals, steam, and ultrasonic cleaners.   D
  Malachite - African 3.5 - 4   impregnated with plastic or other hardened agents to improve appearance and durability rarely   good Malachite is soft, so be mindful of scratching. Avoid chemicals and ultrasonic cleaners.   I
  Marcasite - Swiss   6 - 6.5   none n/a n/a   n/a Normal Care   n/a
  Marialite   5.5- 6   Can be Irradiated Improve Color Occasionally   Very Good Avoid harsh chemicals, steam and ultrasonic cleaners. Avoid sudden temperature changes   n/a
  Marvelous Meteorites  3-4   none n/a n/a   n/a Normal Care   n/a
  Marvelous Meteorites  3-4   Coated To protect and prevent oxidation commonly   good Avoid acids and chemicals   C
  Moldavite - Bohemian 5.5   none n/a n/a   n/a Normal Care   n/a
  Mookaite - Kennedy Range   6 - 7   none n/a n/a   n/a Normal Care   n/a
  Moonstones - Sri Lankan Metallic  6 -6.5   none n/a n/a   n/a Normal Care   n/a
  Moonstones - Sri Lankan Orange  6 -6.5   none n/a n/a   n/a Normal Care   n/a
  Moonstones - Sri Lankan Pink  6 -6.5   none n/a n/a   n/a Normal Care   n/a
  Moonstones - Sri Lankan Rainbow   6 - 6.5   none n/a n/a   n/a Normal Care   n/a
  Morganite - Marropino 7.5 - 8   irradiated to produce color commonly   excellent Normal Care   IR
  Morganite - Marropino   7.5 - 8   heated to improve color commonly   excellent Normal Care   H
Gemstone N - O                    
  Nuummite - Greenland 5.5 to 6.0   n/a n/a n/a   n/a Care and Handling: Normal Care. Avoid heat, chemicals, ultrasonic and steam cleaners.   n/a
  Obsidian - Coffee 5.0 - 5.5   None n/a n/a   n/a Avoid harsh chemicals and ultrasonic   n/a
  Opal - created Black, Blue, Orange 5.5 - 6.5   Impregnated with Resin to improve color usually   Good Avoid heat, chemicals, ultrasonic cleaners, and repolishing.   I
  Opal - Australian Boulder 5.5 - 6.5   n/a n/a n/a   n/a Avoid heat, chemicals, ultrasonic cleaners, and repolishing.   n/a
  Opal - Australian Triplet 5.5 - 6.5   Assembled to add color usually   very good  Avoid heat, chemicals, ultrasonic cleaners, and repolishing.   A
  Opal - Canary 6 - 6.5   N/A N/A N/A   N/A Normal Care. Avoid heat, chemicals, ultrasonic and steam cleaners.   N/A
  Opal - Caramel 6 - 6.5   N/A N/A N/A   N/A Normal Care. Avoid heat, chemicals, ultrasonic and steam cleaners.   N/A
  Opal - Ethiopian Welo  5.5- 6   none n/a n/a   n/a Avoid steaming, ultrasonic cleaners, harsh chemicals and abrupt temperature changes.   n/a
  Opal - Ethiopian Welo  5.5- 6   impregnated to improve appearance occasionally   good Avoid harsh chemicals, steam and ultrasonic cleaners. Avoid sudden temperature changes   I
  Opal - Jalisco Fire  5.0 - 6.5   None N/a N/a   N/a Avoid harsh chemicals, steam and ultrasonic cleaners. Avoid sudden temperature changes   n/a
  Opal - Mosaic  5   Assembled  to improve appearance commonly   good Avoid rough handling, contact with water, harsh cleaners and extreme temperatures.   I
  Opal - Natural Australian 5.0 - 6.5   None n/a n/a   n/a Normal Care, Note: this rough is dyed   n/a
  Opal - Oregon Blue  5.5 - 6   none n/a n/a   n/a Normal Care
Note: this rough is dyed
  D
  Opal - Oregon Peach 5.5 - 6.5   none n/a n/a   n/a Normal Care. Avoid heat, chemicals, ultrasonic and steam cleaners.   n/a
  Opal - Peruvian Mint Green  5.5 - 6   none n/a n/a   n/a Normal Care   n/a
  Opal - Peruvian Pink 5.5 - 6   none n/a n/a   n/a Normal Care   n/a
  Opal - Sable Ethiopian  5 - 7   Dyed ,impregnated, waxed/oiled Improve Appearance and Stability Occasionally   Good Avoid harsh chemicals, steam and ultrasonic cleaners. Avoid sudden temperature changes   D,I, W
  Opal - Sierra Madre Purple 5.0 - 6.5   None n/a n/a   n/a Normal Care   n/a
  Opal - Salamanca Fire 5.5 to 6   None N/A N/A   N/A Normal Care. Avoid heat, chemicals, ultrasonic and steam cleaners.   n/a
  Opal - Crimson Fire 5.5 to 6.5   None N/A N/A   N/A Normal Care. Avoid heat, chemicals, ultrasonic and steam cleaners.   N/A
  Orthoclase  6 - 6.5   None n/a n/a   n/a Normal Care   n/a
  Orthoceras  3.5 - 4.5   None n/a n/a   n/a Normal Care   n/a
Gemstone P                    
  Pearl - Tahitian  2.5 - 4   None n/a n/a   n/a Do not use harsh chemicals, steam or ultrasonic cleaners. Pearls should be stored wrapped in a soft cloth. If they require cleaning, soak in warm water with a mild soap, than wrap in a soft cloth to dry. They should be the last item to put on when dressing and the first to take off.   n/a
  Pearl - South Sea  2.5 to 4   None n/a n/a   n/a Do not use harsh chemicals, steam or ultrasonic cleaners. Pearls should be stored wrapped in a soft cloth. If they require cleaning, soak in warm water with a mild soap, than wrap in a soft cloth to dry. They should be the last item to put on when dressing and the first to take off.   n/a
  Petalite 6 to 6.5   None N/A N/A   N/A Normal Care. Avoid heat, chemicals, ultrasonic and steam cleaners.   n/a
  Peridot - Hebei   6.5 - 7   none n/a n/a   n/a Normal Care   n/a
  Peridot - Hebei   6.5 - 7   impregnated, oiled/waxed to approve appearance rarely   fair to good Avoid sudden temperature changes, harsh chemicals, and ultrasonic cleaners.   I, W
  Peridot - Hebei   6.5 - 7   filled to improve clarity rarely   good Avoid sudden temperature changes, harsh chemicals, and ultrasonic cleaners.   FF
  Peridot - Arizona 6.5 to 7   None N/A N/A   N/A Normal Care. Avoid heat, chemicals, ultrasonic and steam cleaners.   n/a
  Pinolith - Austrian 3.5 to 4   None N/A N/A   N/A Normal Care. Avoid heat, chemicals, ultrasonic and steam cleaners.   n/a
  Pietersite - Golden  6.5 - 7   Bleached Improve Color Commonly   Very Good Normal Care   B
  Pietersite - Hunan   7   none n/a n/a   n/a Normal Care   n/a
  Prasiolite - Montezuma   7   heated to create color commonly   excellent Normal Care   H
Gemstone Q                    
  Quartz - African Lilac 7   Assembled - Triplet Improve Stability and Color always   good Avoid harsh chemicals, steam and ultrasonic cleaners. Chipping may remove color. Cannot be re-cut or re-polished.   ASBL
  Quartz - Aurelia Rutilated 7   none n/a n/a   n/a Normal Care   n/a
  Quartz - Arizona Sunset 7   Assembled - Triplet Improve Stability and Color Always   Fair - Good Avoid harsh chemicals, steam and ultrasonic cleaners. Chipping may remove color. Cannot be re-cut or re-polished.   ASBL
  Quartz - Alexandria 7   Assembled - Triplet Improve Stability and Color Always   Fair - Good Avoid harsh chemicals, steam and ultrasonic cleaners. Chipping may remove color. Cannot be re-cut or re-polished.   ASBL
  Quartz - Aqua Terra Costa 7   Assembled - Triplet Improve Stability and Color Always   Fair - Good Avoid harsh chemicals, steam and ultrasonic cleaners. Chipping may remove color. Cannot be re-cut or re-polished.   ASBL
  Quartz - Blazing Red 7   Assembled - Triplet Improve Stability and Color Always   Fair - Good Avoid harsh chemicals, steam and ultrasonic cleaners. Chipping may remove color. Cannot be re-cut or re-polished.   ASBL
  Quartz - Bohemian Pink 7   Assembled - Triplet Improve Stability and Color Always   Fair - Good Avoid harsh chemicals, steam and ultrasonic cleaners. Chipping may remove color. Cannot be re-cut or re-polished.   ASBL
  Quartz - Brazilian Smokey 7   irradiated to create color usually   good Normal Care   IR
  Quartz - Brazilian Watermelon 7   Assembled - Triplet Improve Stability and Color Always   Fair - Good Avoid harsh chemicals, steam and ultrasonic cleaners. Chipping may remove color. Cannot be re-cut or re-polished.   ASBL
  Quartz - Blue 7   Assembled - Triplet Improve Stability and Color Always   Fair - Good Avoid harsh chemicals, steam and ultrasonic cleaners. Chipping may remove color. Cannot be re-cut or re-polished.   ASBL
  Quartz - Blue Sapphire 7   Triplet (two natural colorless quartz are joined together with a colored epoxy) to add color n/a   very good  Normal Care   A
  Quartz - Black Ridge 7   Assembled - Triplet Improve Stability and Color Always   Fair - Good Avoid harsh chemicals, steam and ultrasonic cleaners. Chipping may remove color. Cannot be re-cut or re-polished.   ASBL
  Quartz - Bi-Color Imperial 7   Triplet (two natural colorless quartz are joined together with a colored epoxy) to add color n/a   very good  Normal Care   A
  Quartz - Capri Blue 7   Assembled - Triplet Improve Stability and Color Always   Fair - Good Avoid harsh chemicals, steam and ultrasonic cleaners. Chipping may remove color. Cannot be re-cut or re-polished.   ASBL
  Quartz - Cherry 7   None N/A N/A   N/A Normal Care. Avoid heat, chemicals, ultrasonic and steam cleaners.   N/A
  Quartz - Caribbean 7   Assembled - Triplet Improve Stability and Color Always   Fair - Good Avoid harsh chemicals, steam and ultrasonic cleaners. Chipping may remove color. Cannot be re-cut or re-polished.   ASBL
  Quartz - Celestrial Blue 7   Assembled - Triplet Improve Stability and Color Always   Fair - Good Avoid harsh chemicals, steam and ultrasonic cleaners. Chipping may remove color. Cannot be re-cut or re-polished.   ASBL
  Quartz - Ceylon  7   Assembled - Triplet Improve Stability and Color Always   Fair - Good Avoid harsh chemicals, steam and ultrasonic cleaners. Chipping may remove color. Cannot be re-cut or re-polished.   ASBL
  Quartz - Champagne 7   Assembled - Triplet Improve Stability and Color Always   Fair - Good Avoid harsh chemicals, steam and ultrasonic cleaners. Chipping may remove color. Cannot be re-cut or re-polished.   ASBL
  Quartz - Chartreuse 7   Assembled - Triplet Improve Stability and Color Always   Fair - Good Avoid harsh chemicals, steam and ultrasonic cleaners. Chipping may remove color. Cannot be re-cut or re-polished.   ASBL
  Quartz - Chrome 7   Assembled - Triplet Improve Stability and Color Always   Fair - Good Avoid harsh chemicals, steam and ultrasonic cleaners. Chipping may remove color. Cannot be re-cut or re-polished.   ASBL
  Quartz - Cobalt  7   Assembled - Triplet Improve Stability and Color Always   Fair - Good Avoid harsh chemicals, steam and ultrasonic cleaners. Chipping may remove color. Cannot be re-cut or re-polished.   ASBL
  Quartz - Copper Bloom 7   Assembled - Triplet Improve Stability and Color Always   Fair - Good Avoid harsh chemicals, steam and ultrasonic cleaners. Chipping may remove color. Cannot be re-cut or re-polished.   ASBL
  Quartz - Crackled Green, Blue, Paraiba, Black, Pink, Purple, Orange 7   Heated, Dyed Creates crackling and color Commonly   Very Good Avoid harsh chemicals, steam and ultrasonic cleaners. Chipping may remove color. Cannot be re-cut or re-polished.   H, D
  Quartz - Drusy   7   Dyed Improve Color Commonly   Fair - Good Avoid harsh chemicals, steam and ultrasonic cleaners. Chipping may remove color. Cannot be re-cut or re-polished.   D
  Quartz - Drusy   7   Coated Improve Color Commonly   Very Good Avoid harsh chemicals, steam and ultrasonic cleaners. Chipping may remove color. Cannot be re-cut or re-polished.   C
  Quartz - Drusy   7   heated to improve color occasionally   excellent Normal care   HE
  Quartz - Emerald  (Green Aventurine) 7   None n/a n/a   n/a Normal care   n/a
  Quartz - Galilea Rose   7   none n/a n/a   n/a Normal Care   n/a
  Quartz - Herkimer Diamond   6.5 - 7   none n/a n/a   n/a Normal Care   n/a
  Quartz - Kunzite 7   Triplet (two natural colorless quartz are joined together with a colored epoxy) to add color n/a   very good  Normal Care   A
  Quartz - Indicolita 7   Assembled - Triplet Improve Stability and Color always   Fair - Good Avoid harsh chemicals, steam and ultrasonic cleaners. Chipping may reveal None Color. Cannot be re-cut or re-polished.   ASBL
  Quartz - Larimar 4.5 - 5   Assembled - Doublet Improve Stability and Color Always   Fair - Good Avoid harsh chemicals, steam and ultrasonic cleaners. Chipping may reveal None Color. Cannot be re-cut or re-polished.   ASBL
  Quartz - Lavender Alexite 7   Assembled - Triplet Improve Stability and Color Always   Fair - Good Avoid harsh chemicals, steam and ultrasonic cleaners. Chipping may reveal None Color. Cannot be re-cut or re-polished.   ASBL
  Quartz - Lemon 7   Assembled - Triplet Improve Stability and Color always   Fair - Good Avoid harsh chemicals, steam and ultrasonic cleaners. Chipping may reveal None Color. Cannot be re-cut or re-polished.   ASBL
  Quartz - Madeira 7   can be Heated Improve Stability and Color always   Fair - Good Avoid harsh chemicals, steam and ultrasonic cleaners. Chipping may reveal None Color. Cannot be re-cut or re-polished.   H
  Quartz - Marsala Triplete 7   Assembled - Triplet Improve Stability and Color always   Fair - Good Avoid harsh chemicals, steam and ultrasonic cleaners. Chipping may reveal None Color. Cannot be re-cut or re-polished.   ASBL
  Quartz - Morganique 7   Assembled - Triplet Improve Stability and Color always   Fair - Good Avoid harsh chemicals, steam and ultrasonic cleaners. Chipping may reveal None Color. Cannot be re-cut or re-polished.   ASBL
  Quartz - Morganite 7   Triplet (two natural colorless quartz are joined together with a colored epoxy) to add color n/a   very good  Normal Care   A
  Quartz - Mystic Chrome 7-7.5   Coated To create color frequently   very good Gentle care. Avoid abrasions. Chipping may reveal natural color. Cannot be re-cut or re-polished. Avoid heat, chemicals, and ultrasonic cleaners.   C
  Quartz - Mystic Fire 7-7.5   Coated To create color frequently   very good Gentle care. Avoid abrasions. Chipping may reveal natural color. Cannot be re-cut or re-polished. Avoid heat, chemicals, and ultrasonic cleaners.   C
  Quartz - Neon Apatite 7   Assembled - Triplet Improve Stability and Color n/a   Fair - Good Avoid harsh chemicals, steam and ultrasonic cleaners. Chipping may reveal None Color. Cannot be re-cut or re-polished.   ASBL
  Quartz - Opulant 7-7.5   Coated To create color frequently   very good Gentle care. Avoid abrasions. Chipping may reveal natural color. Cannot be re-cut or re-polished. Avoid heat, chemicals, and ultrasonic cleaners.   C
  Quartz - Ouro Verde 7   irradiated; heated to induce color; to improve color always   very good Normal Care. Avoid heat, chemicals, ultrasonic and steam cleaners.   IR; H
  Quartz - Padparasha 7   Assembled - Triplet Improve Color Always   Fair - Good Avoid harsh chemicals, steam and ultrasonic cleaners. Chipping may reveal None Color. Cannot be re-cut or re-polished.   ASBL
  Quartz - Papaya 7   Assembled - Triplet Improve Stability and Color Always   Fair - Good Avoid harsh chemicals, steam and ultrasonic cleaners. Chipping may reveal None Color. Cannot be re-cut or re-polished.   ASBL
  Quartz - Paraiba 7   Assembled - Triplet Improve Stability and Color Always   Fair - Good Avoid harsh chemicals, steam and ultrasonic cleaners. Chipping may reveal None Color. Cannot be re-cut or re-polished.   ASBL
  Quartz - Peacock 7   Assembled - Triplet Improve Stability and Color Always   Fair - Good Avoid harsh chemicals, steam and ultrasonic cleaners. Chipping may reveal None Color. Cannot be re-cut or re-polished.   ASBL
  Quartz - Peridot 7   Assembled - Triplet Improve Stability and Color Always   Fair - Good Avoid harsh chemicals, steam and ultrasonic cleaners. Chipping may reveal None Color. Cannot be re-cut or re-polished.   ASBL
  Quartz - Playa
(Also known as La Chiva Quartz) 
7   Triplet to create color always   very good  Normal Care. Avoid heat, chemicals, ultrasonic and steam cleaners.   A
  Quartz - Radiant Orchid  7   Assembled - Triplet Improve Stability and Color Always   Fair - Good Avoid harsh chemicals, steam and ultrasonic cleaners. Chipping may reveal None Color. Cannot be re-cut or re-polished.   ASBL
  Quartz - Rainbow Genesis   7   Coated Improve Stability and Color Always   Fair - Good Avoid harsh chemicals, steam and ultrasonic cleaners. Chipping may reveal None Color. Cannot be re-cut or re-polished.   C
  Quartz - Royal Blue 7   Assembled - Triplet Improve Stability and Color Always   Fair - Good Avoid harsh chemicals, steam and ultrasonic cleaners. Chipping may reveal None Color. Cannot be re-cut or re-polished.   ASBL
  Quartz - Rubellite 7   Assembled - Triplet Improve Stability and Color Always   Fair - Good Avoid harsh chemicals, steam and ultrasonic cleaners. Chipping may reveal None Color. Cannot be re-cut or re-polished.   ASBL
  Quartz - Ruby 7   Assembled - Triplet Improve Stability and Color Always   Fair - Good Avoid harsh chemicals, steam and ultrasonic cleaners. Chipping may reveal None Color. Cannot be re-cut or re-polished.   ASBL
  Quartz - Scarlet Red 7-7.5   Coated To create color frequently   very good Gentle care. Avoid abrasions. Chipping may reveal natural color. Cannot be re-cut or re- polished. Avoid heat, chemicals, and ultrasonic cleaners.   C
  Quartz - Smoketrine 7   None n/a Rarely   Very Good Avoid harsh chemicals, steam and ultrasonic cleaners. Chipping may reveal None Color.   n/a
  Quartz - Sunfire  7   Assembled - Triplet Improve Stability and Color n/a   Fair Avoid harsh chemicals, steam and ultrasonic cleaners. Chipping may reveal None Color. Cannot be re-cut or re-polished.   ASBL
  Quartz - Swiss Blue 7   Assembled - Triplet Improve Stability and Color n/a   Fair Avoid harsh chemicals, steam and ultrasonic cleaners. Chipping may reveal None Color. Cannot be re-cut or re-polished.   ASBL
  Quartz - Alexandria 7   Triplet (two natural colorless quartz are joined together with a colored epoxy) to add color always   very good   Normal Care. Avoid heat, chemicals, ultrasonic and steam cleaners.   n/a
  Quartz - Golden Rutilated 7   Assemble - Triplet Improve Stability and Color Always   Fair - Good Avoid harsh chemicals, steam and ultrasonic cleaners. Chipping may reveal None Color. Cannot be re-cut or re-polished.   n/a
  Quartz - Salmon 7   Assembled - Triplet Improve Stability and Color Always   Fair - Good Avoid harsh chemicals, steam and ultrasonic cleaners. Chipping may reveal None Color. Cannot be re-cut or re-polished.   ASBL
  Quartzite 6.5- 7.0   Dyed to improve durability and appearance commonly   good  Avoid abrasives, ultrasonic, solvents and heat.   D
Gemstone R                    
  Rhodochrosite - Argentinian  3.5 - 4   none n/a n/a   n/a Rhodochrosite is soft, so be mindful of scratching and chipping.   n/a
  Rhodonite - Zaire  5.5 - 6   none n/a n/a   n/a Normal, gentle handling   n/a
  Rubellite - Ouro Fino  7 - 7.5   heated to improve color commonly   excellent Normal Care   H
  Rubellite - Ouro Fino  7 - 7.5   irradiated to create color occasionally   good Normal Care   IR
  Rubellite - Ouro Fino  7 - 7.5   oiled/resin infused to improve appearance occasionally   fair to good Avoid temperature changes, steaming, chemicals, and ultrasonic cleaners.   O
  Rubellite - Ouro Fino  7 - 7.5   dyed/stained to alter color rarely   poor to fair Avoid temperature changes, steaming, chemicals, and ultrasonic cleaners.   D
  Ruby 9   heated to improve color usually   good to excellent Normal Care   H
  Ruby - John Saul   9   heated to improve color usually   good to excellent Normal Care   H
  Ruby - Kenyan Star  9   fissure filled/Diffused to improve durability and appearance and Phenomena commonly   fair to good Avoid harsh chemicals, steam cleaners, and ultrasonic cleaners.   FF
  Ruby - Kenyan Star  9   heated to improve color commonly   good to excellent Normal Care   H
  Ruby - Niassa   9   fissure filled to improve durability and appearance commonly   fair to good Avoid harsh chemicals, steam cleaners, and ultrasonic cleaners.   FF
  Ruby - Burmese 9   Heated Improve Color Always   Fair Avoid harsh chemicals, steam and ultrasonic cleaners. Avoid sudden temperature changes   H
  Ruby Zoisite 6.5 to 7   None n/a n/a   n/a Normal Care. Avoid heat, chemicals, ultrasonic and steam cleaners.   n/a
Gemstone S                    
  Sapphire - Golden 9   heated to add color commonly   very good  Avoid repolishing/recutting.   H
  Sapphire - Kanchanaburi Blue  9   heated to improve color usually   excellent Normal Care   H
  Sapphire - Kanchanaburi Blue  9   surface diffused to add color occasionally   good Avoid repolishing/re-cutting.   DF
  Sapphire - Kanchanaburi Blue  9   diffused to improve color occasionally   excellent Normal Care   DF
  Sapphire - Kanchanaburi Blue  9   Fissure Filled Improve Clarity Rarely   Fair Avoid harsh chemicals, steam and ultrasonic cleaners. Avoid sudden temperature changes   FF
  Sapphire - Kanchanaburi Blue  9   irradiated to create color occasionally   very poor Fades quickly in light or heat.   IR
  Sapphire - Niassa Pink  9   fissure filled, heated to improve durability and appearance, to enhance color commonly   fair to good Avoid harsh chemicals, steam cleaners, and ultrasonic cleaners.   FF H
  Sapphire - Chocolate 9   None n/a n/a   n/a Normal Care   n/a
  Sapphire - Mauve 9   Heating Improve Color Always   Fair Avoid harsh chemicals, steam and ultrasonic cleaners. Avoid sudden temperature changes   H
  Sapphire - Purple  9   Diffused, Heated Improve Color and Durability Always   Fair Avoid harsh chemicals, steam and ultrasonic cleaners. Avoid sudden temperature changes   DF, H
  Sapphire - Sunset 9   Diffused, Heated Improve Color and Durability Always   Fair Avoid harsh chemicals, steam and ultrasonic cleaners. Avoid sudden temperature changes   DF, H
  Sapphire - Masoala 9   Dyed/Fissure Filled Improve Color Always   Fair Avoid harsh chemicals, steam and ultrasonic cleaners. Avoid sudden temperature changes   D, FF
  Sapphire - Yellow 9   Heated to add color always   very good   Normal Care. Avoid heat, chemicals, ultrasonic and steam cleaners.   n/a
  Sapphire - Madagascar Purple  9   Diffused, Heated Improve Color and Durability Always   Fair Avoid harsh chemicals, steam and ultrasonic cleaners. Avoid sudden temperature changes   DF, H
  Sapphire - Silver  9   None n/a n/a   n/a Normal Care   n/a
  Sapphire - Thai Blue Star  9   Star Diffused Improve Color Rarely   Fair Avoid harsh chemicals, steam and ultrasonic cleaners. Cannot be re-polished or re-cut.   DF
  Scapolite - Cat's Eye   5.5 - 6   none n/a n/a   n/a Avoid chemicals, steam, ultrasonic cleaners and exposure to strong sunlight.   n/a
  Shungite  3.5 to 4   n/a n/a n/a   n/a Normal Care. Avoid heat, chemicals, ultrasonic and steam cleaners.   n/a
  Scapolite - Mocha 5.5 - 6   Irradiated Improve Color Commonly   Fair - Good Avoid chemicals, steam, ultrasonic cleaners and exposure to strong sunlight.   IR
  Seraphinite - Siberian  2.5 - 5.5   none n/a n/a   n/a Avoid sudden temperature changes, chemicals, and ultrasonic cleaners.   n/a
  Seraphinite - Siberian  2.5 - 5.5   impregnated, waxed/oiled to improve hardness and luster commonly   good to very good Avoid ultrasonic chemicals and solvents.   I, W
  Shadowkite - Table Mountain  2.0-4.0   impregnated to improve color and stability Occasionally   Very Good Avoid scratching, ultrasonic cleaners, harsh household chemicals, prolonged exposure to direct sunlight and excessive heat   I
  Sillimanite - Green   7 - 7.5   Dyed Improve Color Always   Fair Avoid harsh chemicals, steam and ultrasonic cleaners. Avoid sudden temperature changes   D
  Sphene - Sava   5 - 5.5   none n/a n/a   n/a Sphene requires no special care, though it is best suited for earrings and pendants due to its softness.   n/a
  Sphene - Sava   5 - 5.5   heated to create red or orange color rarely   fair to good Sphene requires no special care, though it is best suited for earrings and pendants due to its softness.   H
  Spinel - Mahenge Red 8   none n/a n/a   n/a Normal Care   n/a
  Spinel - Mahenge Purple  8   none n/a n/a   n/a Normal Care   n/a
  Spinel - Thai Black  8   none n/a n/a   n/a Normal Care   n/a
  Spinel - Burmese 8   Heating To improve color Always   Very good Normal Care. Avoid heat, chemicals, ultrasonic and steam cleaners.   H
  Stichtite - Tasmanian   1.5 – 2.0   stabilized  n/a n/a   n/a Avoid sudden temperature changes, chemicals, rough handling, heat, and ultrasonic cleaners.   n/a
  Strontium Titanate   5 - 5.5   lab created  n/a n/a   n/a Normal, gentle handling Strontium Titanate is a soft stone, so be mindful of scratching.   n/a
  Sunstone - Madras 6 - 6.5   None n/a n/a   n/a Avoid sudden temperature changes, chemicals, rough handling, heat, and ultrasonic cleaners.   n/a
  Sunstone - Masai   6 - 6.5   None n/a n/a   n/a Avoid sudden temperature changes, chemicals, rough handling, heat, and ultrasonic cleaners.   n/a
  Sunstone - Sri Lankan  6 - 6.5   None n/a n/a   n/a Avoid sudden temperature changes, chemicals, rough handling, heat, and ultrasonic cleaners.   n/a
  Sphene - Madagascar 5.5   None n/a n/a   n/a Normal Care. Avoid heat, chemicals, ultrasonic and steam cleaners.   n/a
  Sphalerite - Picos Altos 3.5 to 4   None n/a n/a   n/a Normal Care. Avoid heat, chemicals, ultrasonic and steam cleaners.   n/a
  Swarovski Crystal - All colors  5.0-5.5   Coated Improve Color Commonly   Very Good Avoid harsh chemicals, steam and ultrasonic cleaners. Avoid sudden temperature changes   C
Gemstone T                    
  Tanzanite 6.5 - 7   Heated Improve Color Always   Excellent Normal Care   H
  Tanzanite - Bondi Blue 6.5 - 7   Heated Improve Color Always   Excellent Normal Care   H
  Tanzanite - Natural Green   6.5 - 7   Heated Improve Color Always   Fair Avoid harsh chemicals, steam and ultrasonic cleaners. Avoid sudden temperature changes   H
  Tanzanite - Natural Golden 6.5 - 7   None n/a n/a   n/a Normal Care and Handling   n/a
  Tanzanite - Peacock 6.5 - 7   Heating Improve Color Always   Fair Avoid harsh chemicals, steam and ultrasonic cleaners. Avoid sudden temperature changes   H
  Thulite Norwegian 6-6.5   Coated Improve Color and Durability Commonly   Fair Avoid harsh chemicals, steam and ultrasonic cleaners. Avoid sudden temperature changes   C
  Tiger Iron 6.5 to 7   None n/a n/a   n/a Normal Care   n/a
  Tiffany Stone - Utah  6.0 - 7.0    none n/a n/a   n/a Normal Care   n/a
  Tigers Eye  - South African  7   none N/a commonly   n/a normal care   n/a
  Tigers Eye  - South African  7   heated to alter color rarely   good to very good Avoid harsh chemicals, ultrasonic cleaners, and steaming.   H
  Tigers Eye  - South African  7   Dyed to alter color rarely   good to very good Avoid harsh chemicals, ultrasonic cleaners, and steaming.   D
  Topaz - Blazing Red 8   Coated Improve Color Occasionally   Very Good Normal Care and Handling   C
  Topaz - Electric Blue  8   Heated Improve Color Always   Very Good Avoid harsh chemicals, steam and ultrasonic cleaners. Cannot be re-polished or re-cut.   H
  Topaz - Electric Blue  8   Irradiated Improve Color Always   Very Good Avoid harsh chemicals, steam and ultrasonic cleaners. Cannot be re-polished or re-cut.   IR
  Topaz - Marambaia 8   Heated/Irradiated to add color always   very good   Normal Care. Avoid heat, chemicals, ultrasonic and steam cleaners.   n/a
  Topaz - Mystic Twilight 8   Coated to create color always   very good   Normal Care. Avoid heat, chemicals, ultrasonic and steam cleaners.   C
  Topaz - Electric Blue  8   irradiation followed by heat (annealing) to produce to blue color usually   excellent Avoid steaming, ultrasonic cleaners, and abrupt temperature changes.   IR, H
  Topaz - Electric Blue  8   none n/a n/a   n/a Normal Care   n/a
  Topaz - London Blue  8   heated to produce to blue color usually   excellent Normal Care   H
  Topaz - London Blue  8   irradiated to produce to blue color usually   excellent Normal Care   IR
  Topaz - London Blue  8   irradiation followed by heat (annealing) to produce to blue color usually   excellent Avoid steaming, ultrasonic cleaners, and abrupt temperature changes.   IR, H
  Topaz - Mercury Mystic 8   Coated Improve Color Commonly   Fair Avoid harsh chemicals, steam and ultrasonic cleaners. Cannot be re-cut or re-polished.   C
  Topaz - Northern Lights Mystic  8   Coated Improve Color Commonly   Fair Avoid harsh chemicals, steam and ultrasonic cleaners. Cannot be re-cut or re-polished.   C
  Topaz - Ouro Preto Diamond- Cut  8   None n/a n/a   n/a Normal Care and Handling   n/a
  Topaz - Prism Blue 8   Coated Improve Color Commonly   Fair Avoid harsh chemicals, steam and ultrasonic cleaners. Cannot be re-cut or re-polished.   C
  Topaz - Signity 8   Coated to add color Always   very good Normal Care. Avoid heat, chemicals, ultrasonic and steam cleaners.   C
  Tourmaline - Mozambique Paraiba   7 - 7.5   Heated Improved Color rarely   Fair Avoid harsh chemicals, steam and ultrasonic cleaners. Avoid sudden temperature changes   H
  Tourmaline - Australian Black 7 to 7.5   None n/a n/a   n/a Avoid harsh chemicals, steam and ultrasonic cleaners. Avoid sudden temperature changes   H
  Tourmaline - Pink 7 to 7.5   Heated Improved Color Rarely   Fair Avoid harsh chemicals, steam and ultrasonic cleaners. Avoid sudden temperature changes   H
  Turkizite   6.5 - 7.0   None n/a n/a   n/a Avoid harsh chemicals, steam and ultrasonic cleaners.   n/a
  Turquoise - Anahi 5-6   Dyed to enhance color commonly   good Avoid hot water, harsh household chemicals, and ultrasonic cleaners.   D
  Turquoise - Kingman   5 - 6   Stabalized, Zachary Process Improve Durability Always   Good Avoid harsh chemicals, steam and ultrasonic cleaners. Cannot be re-cut or re-polished.   S,Z
  Turquoise - Mojave   5 - 6   impregnated to improve appearance commonly   Good Avoid  hot water, household chemicals, and ultrasonic cleaners.   I
  Turquoise - Mojave   5 - 6   Waxed/Oiled Improve durability and Appearance Always   Good Avoid harsh chemicals, steam and ultrasonic cleaners. Cannot be re-cut or re-polished.   W
  Turquoise - Mojave   5 - 6   Dyed Improve Color Rarely   Good Avoid harsh chemicals, steam and ultrasonic cleaners. Cannot be re-cut or re-polished.   D
  Turquoise - Mojave   5 - 6   Composite Improve durability Always   Good Avoid harsh chemicals, steam and ultrasonic cleaners. Cannot be re-cut or re-polished.   CMP
  Turquoise - Sleeping Beauty   5 - 6   Zachary process to improve durability and appearance commonly   very good Avoid hot water, harsh household chemicals, and ultrasonic cleaners.   Z
  Turquoise - Sonoran Blue 5 - 6   Zachary process to improve durability and appearance commonly   very good Avoid hot water, harsh household chemicals, and ultrasonic cleaners.   Z
Gemstone U - V                    
  Variscite - Utah   3.5-4.5   none n/a n/a   n/a Color may fade in strong light.   n/a
  Vesuvianite   6.5   None n/a n/a   n/a Avoid Scratching   n/a
  Vivianite - Australian 1.5 - 2.0   none n/a n/a   good Vivianite needs to be cared for by keeping it indoors and not exposing it to sunlight for too long as the UV rays will darken it, and if left out it will go completely black.    n/a
Gemstone W - Z                    
  Zircon - Cambodian Blue 6.5 - 7   Heated To enhance color usually   good Avoid harsh abrasives    H
  Zircon - Umba River 6.5 - 7   Heated Improve Color Commonly   Very Good Avoid harsh chemicals, steam and ultrasonic cleaners. Avoid sudden temperature changes   H
  Zircon - White 6.5 - 7   None n/a n/a   n/a Avoid harsh chemicals, steam and ultrasonic cleaners.   n/a
  Zirconia - Swarovski - All colors 8   Coated Improve Color Always   Very Good Avoid Sudden Temperature changes, chemcials, and ultrasonic   C