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  8.5   heated n/a n/a   good Normal Care
Note: synthetic
  H
  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   none n/a n/a   n/a Amethyst may fade with long exposure to direct, bright sunlight.   n/a
  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 4   impregnated to improve appearance and stability usually   fair to good Avoid heat, harsh chemicals, and ultrasonic cleaners
Note: doublets or triplets
  I
  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   Natural  N/a n/a   good Apatite is moderately soft, so be mindful of scratching. Avoid heat, harsh chemicals, and ultrasonic cleaners.    
  Apatite - Blue 5   Natural  N/a n/a   good Apatite is moderately soft, so be mindful of scratching. Avoid heat, harsh chemicals, and ultrasonic cleaners.    
  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   Natural  N/A N/A   good Apatite is moderately soft, so be mindful of scratching. Avoid heat, harsh chemicals, and ultrasonic cleaners.    
  Apatite - Indian Ocean   5   Natural  N/a n/a   good Apatite is moderately soft, so be mindful of scratching. Avoid heat, harsh chemicals, and ultrasonic cleaners.   n/a
  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   none n/a rarely   n/a Apatite is moderately soft, so be mindful of scratching. Avoid heat, harsh chemicals, and ultrasonic cleaners.    
  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   no treatment n/a n/a   n/a Avoid scratching, ultrasonic cleaners, harsh household chemicals, prolonged exposure to direct sunlight and excessive heat   n/a
  Chrysocolla - Parrot Wing 2.0-4.0   no treatment n/a n/a   n/a Avoid scratching, ultrasonic cleaners, harsh household chemicals, prolonged exposure to direct sunlight and excessive heat   n/a
  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   Natural NA NA   good Normal Care   NA
  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   stabilization to increase durability Always   Very good Normal Care. Avoid heat, chemicals, ultrasonic and steam cleaners.   S
Gemstone E                    
  Emerald 7.5-7   no treatment n/a very rarely   n/a Normal Care    
  Emerald - Boyaca Colombian  7.5-7   no treatment n/a very rarely   n/a Normal Care   n/a
  Emerald - Boyacá Columbian 7.5-8   oiled/resin infused to improve clarity occasionally   very good Avoid heat, harsh chemicals, and ultrasonic cleaners   0
  Emerald - Boyacá Columbian 7.5 - 8   hardened polymers to improve appearance and clarity occasionally   very good Normal Care   P
  Emerald - Boyaca Columbian 7.5-8   dyed with colorless polymers to improve color and clarity rarely   good Avoid heat, harsh chemicals, and ultrasonic cleaners   n/a
  Emerald - Kagem Zambian 7.5 - 8   hardened polymers to improve appearance and clarity occasionally   very good Normal Care   P
  Emerald - Kagem Zambian  7.5 - 8   waxed/oiled to enhance color, clarity and stability commonly   fair to good Avoid wearing emerald jewelry when working with harsh chemicals or household cleaners, such as bleach or acids. When cleaning, you can use warm soapy water and a tissue or a soft cloth. Be sure to rinse the stones well to remove all soapy residue.   W
  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   irradiated  to enhance color, clarity and stability Always   Good Avoid scratching, temperature changes, steaming, chemicals, and ultrasonic cleaners.   n/a
  Fluorite - Chinese Blue   4   irradiated to create color usually   fair to good Avoid scratching, temperature changes, steaming, chemicals, and ultrasonic cleaners.   IR
  Fluorite - Color Changing 4   irradiated to create color usually   fair to good Avoid scratching, temperature changes, steaming, chemicals, and ultrasonic cleaners.   IR
  Fluorite - Mint Green   4   irradiated to create color usually   fair to good Avoid scratching, temperature changes, steaming, chemicals, and ultrasonic cleaners.   IR
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   Natural  n/a n/a   excellent Normal 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  6.5 - 7   waxed/oiled to improve appearance commonly   fair Avoid prolonged exposure to strong light, ultrasonic cleaners and harsh chemicals. May discolor over time.   W
  Jade  6.5 - 7   dyed/stained to add color occasionally   variable Avoid strong light, chemicals, and ultrasonic cleaners.   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   no treatment n/a n/a   Good Normal Care   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   no treatment n/a n/a   n/a Normal, gentle handling. Avoid exposure to acids, heat and ultrasonic cleaners.    
  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   none n/a n/a   n/a Avoid chemicals, steam, ultrasonic cleaners and exposure to strong sunlight.   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                    
  Obsidian - Coffee 7-7.5   N/A N/A N/A   Good Normal Care    
  Opal - created Black, Blue, Orange 4   Impregnated with Resin to improve color usually   Good Avoid heat, chemicals, ultrasonic cleaners, and repolishing.   I
  Opal - Australian Boulder 5.5 - 6.5   oiled/resin infused to improve appearance and clarity occasionally   fair Avoid heat, chemicals, ultrasonic cleaners, and repolishing.   O
  Opal - Australian Triplet 5.5 - 6.5   Assembled to add color usually   very good  Avoid heat, chemicals, ultrasonic cleaners, and repolishing.   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     I
  Opal - Jalisco Fire  5.5 - 6   Natural  N/a N/a   good Avoid water, heat and solvents. Fire Opal is moderately soft, so be mindful of scratching.   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 5.5 - 6   Natural n/a n/a   n/a Normal Care, Note: this rough is dyed    
  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 to improve color n/a   n/a n/a   D,I, W
  Opal - Sierra Madre Purple 5.5 - 6   Natural  N/a N/a   good Avoid use a steamer or ultrasonic,  harsh cleaning agents, perfume, hand soap, high temperatures or sudden temperature changes; simply wipe with a clean soft cloth.    
  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
  Orthoclase  6 - 6.5   n/a n/a n/a   n/a n/a   n/a
  Orthoceras  3.5 to 4.5   n/a n/a n/a   n/a Normal Care. Avoid heat, chemicals, ultrasonic and steam cleaners.   n/a
Gemstone P                    
  Pearl - Tahitian  4   n/a n/a n/a   n/a To be dampened from time to time in lightly salted water, never be wrapped in cotton or wool because the heat generated would add to the risk of drying out, threatening to turn the pearls brown   n/a
  Pearl - South Sea  2.5 to 4   n/a n/a n/a   n/a Normal pearl care. Avoid heat, chemicals, ultrasonic and steam cleaners.   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   Bleaching To enhance durability commonly   good Normal Care   n/a
  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   Triplet (two natural
colorless quartz are
joined together with a
colored epoxy)
Modify Hue | Improve
Durability
always   good Avoid intense heat. Avoid harsh
chemicals. Avoid ultrasonic
cleaners.
  A
  Quartz - Aurelia Rutilated 7   none n/a n/a   n/a Normal Care   n/a
  Quartz - Arizona Sunset 7   Triplet To create color Always   Very good Normal Care. Avoid heat, chemicals, ultrasonic and steam cleaners.   A
  Quartz - Alexandria 7   Triplet To create color Always   Very good Normal Care. Avoid heat, chemicals, ultrasonic and steam cleaners.   A
  Quartz - Aqua Terra Costa 7   Triplet To create color Always   Very good Normal Care. Avoid heat, chemicals, ultrasonic and steam cleaners.   A
  Quartz - Blazing Red 7   Triplet (two natural colorless quartz are joined together with a colored epoxy) to add color always   good Avoid heat, harsh chemicals, and ultrasonic cleaners
Note: assemble
  A
  Quartz - Bohemian Pnk 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.   A
  Quartz - Brazilian Smokey 7   irradiated to create color usually   good Normal Care   IR
  Quartz - Brazilian Watermelon 7 - 7.5   Triplet (two natural colorless quartz are joined together with a colored epoxy) to add color always   good Avoid heat, harsh chemicals, and ultrasonic cleaners   A
  Quartz - Blue 7   Triplet (two natural colorless quartz are joined together with a colored epoxy) to add color n/a   very good  Normal Care   A
  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 - 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   Triplet (two natural colorless quartz are joined together with a colored epoxy) to add color n/a   good to very good Normal Care
Note: assembled
  A
  Quartz - Caribbean 7   Triplet (two natural colorless quartz are joined together with a colored epoxy) to add color n/a   good to very good Normal Care
Note: assembled
  A
  Quartz - Celestrial Blue 7-7.5   Coated To create color frequently   good to very good Gentle care. Avoid abrasions. Chipping may reveal natural color. Cannot be re-cut or re-polished. Avoid heat, chemicals, and ultrasonic cleaners.   A
  Quartz - Ceylon  7   Triplet (two natural colorless quartz are joined together with a colored epoxy) to add color n/a   very good  Normal Care   A
  Quartz - Champagne 7   Triplet (two natural colorless quartz are joined together with a colored epoxy) to add color n/a   very good  Normal Care   A
  Quartz - Chartreuse 7   Triplet (two natural colorless quartz are joined together with a colored epoxy) to add color n/a   very good  Normal Care   A
  Quartz - Chrome 7   Triplet (two natural colorless quartz are joined together with a colored epoxy) to add color n/a   very good  Normal Care   A
  Quartz - Cobalt Triplete 7   Triplet (two natural colorless quartz are joined together with a colored epoxy) to add color n/a   very good  Normal Care   A
  Quartz - Copper Bloom 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.   A
  Quartz - Crackled Green, Blue, Paraiba, Black, Pink, Purple, Orange 7   Heating followed by cooling and Dyeing Create crackling and color usually   good Gentle care. Avoid abrasions. Chipping may reveal natural color. Cannot be re-cut or re- polished. Avoid heat, chemicals, and ultrasonic cleaners.    
  Quartz - Drusy   7   dyeing to create color usually   good Gentle care. Avoid abrasions. Chipping may reveal natural color. Cannot be re-cut or re-polished. Avoid heat, chemicals, and ultrasonic cleaners.   D
  Quartz - Drusy   7   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.   CVD
  Quartz - Drusy   7   heated to improve color occasionally   excellent Normal care   HE
  Quartz - Emerald  (Green Aventurine) 7   Natural  N/A N/a   Good 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   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 - Larimar Doublet 4.5 - 5   Assembled to add color usually   Good  Avoid heat, chemicals, ultrasonic cleaners, and repolishing.   A
  Quartz - Lavender Alexite Triplet 7   Triplet (two natural colorless quartz are joined together with a colored epoxy) to add color n/a   very good  Normal Care   A
  Quartz - Lemon 7   Triplet (two natural colorless quartz are joined together with a colored epoxy) to add color n/a   very good  Normal Care   A
  Quartz - Madeira 7   Triplet (two natural colorless quartz are joined together with a colored epoxy) to add color n/a   very good  Normal Care   A
  Quartz - Marsala Triplete 7   Triplet (two natural colorless quartz are joined together with a colored epoxy) to add color n/a   very good  Normal Care   A
  Quartz - Morganique 7   Triplet (two natural colorless quartz are joined together with a colored epoxy) to add color n/a   very good  Normal Care   A
  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   Triplet (two natural colorless quartz are joined together with a colored epoxy) to add color n/a   very good  Normal Care   A
  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   Triplet (two natural colorless quartz are joined together with a colored epoxy) to add color n/a   very good  Normal Care   A
  Quartz - Papaya 7   Triplet (two natural colorless quartz are joined together with a colored epoxy) to add color n/a   very good  Normal Care   A
  Quartz - Paraiba 7   Triplet (two natural colorless quartz are joined together with a colored epoxy) to add color n/a   very good  Normal Care   A
  Quartz - Peacock 7   Triplet (two natural colorless quartz are joined together with a colored epoxy) to add color n/a   very good  Avoid heat, harsh chemicals, and ultrasonic cleaners   A
  Quartz - Peridot 7   Triplet (two natural colorless quartz are joined together with a colored epoxy) to add color n/a   very good  Normal Care   A
  Quartz - Radiant Orchid  7   Triplet (two natural colorless quartz are joined together with a colored epoxy) to add color n/a   good to very good Normal Care
Note: assembled
  A
  Quartz - Rainbow Genesis   7   Triplet (two natural colorless quartz are joined together with a colored epoxy)) to add color n/a   good to very good Normal Care
Note: assembled
  A
  Quartz - Royal Blue 7   Triplet (two natural colorless quartz are joined together with a colored epoxy) to add color n/a   very good  Normal Care   A
  Quartz - Rubellite 7   Triplet (two natural colorless quartz are joined together with a colored epoxy) to add color n/a   very good  Normal Care   A
  Quartz - Ruby 7   Triplet (two natural colorless quartz are joined together with a colored epoxy) to add color n/a   very good  Normal Care   A
  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   no treatment n/a n/a   very good Avoid abrasives, ultrasonic, solvents and heat.   C
  Quartz - Sunfire  7   Triplet (two natural colorless quartz are joined together with a colored epoxy) to add color n/a   very good  Normal Care
Note: assembled
  A
  Quartz - Swiss Blue 7   Triplet (two natural colorless quartz are joined together with a colored epoxy) to add color n/a   very good  Normal Care   A
  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   None N/A N/A   N/A Normal Care. Avoid heat, chemicals, ultrasonic and steam cleaners.   n/a
  Quartz - Salmon 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
  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 to add color always   very good   Normal Care. Avoid heat, chemicals, ultrasonic and steam cleaners.   n/a
  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   filled/cobalt + lead glass to add color and improve clarity rarely   fair to good Avoid chemicals, ultrasonic cleaners, and abrupt 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. Avoid heat, chemicals, ultrasonic and steam cleaners.   n/a
  Sapphire - Mauve 9   Heating To create color Always   Very good Normal Care. Avoid heat, chemicals, ultrasonic and steam cleaners.   H
  Sapphire - Sunset 9   Heating, Diffusion To create color Always   Very good Normal Care. Avoid heat, chemicals, ultrasonic and steam cleaners.   H, DF
  Sapphire - Masoala 9   fissure filled to improve durability and appearance always   fair to good Normal Care. Avoid heat, chemicals, ultrasonic and steam cleaners.   n/a
  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 or heated to add color commonly   fair to good Avoid repolishing/re-cutting.   DF, H
  Sapphire - Silver  9   no treatment n/a n/a   Very Good Normal Care   n/a
  Sapphire - Thai Blue Star  9   surface/Star diffused to add color occasionally   good Avoid repolishing/re-cutting.   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
  Scapolite - Mocha 5.5 - 6   Cobalt Treatment-Gamma Irradiation Enhance Color usually   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   no treatment n/a n/a   n/a Avoid scratching, ultrasonic cleaners, harsh household chemicals, prolonged exposure to direct sunlight and excessive heat   n/a
  Sillimanite - Green   7 - 7.5   dyed/stained n/a n/a   n/a Normal Care   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
  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 To create color usually   Good Avoid rough handling, contact with water, harsh cleaners and extreme temperatures   C
Gemstone T                    
  Tanzanite 6.5 - 7   heated to improve color usually   excellent Care should be taken due to Tanzanite's relative softness. Avoid ultrasonic and steam cleaners. Avoid sudden temperature changes and rough handling.   H
  Tanzanite - Bondi Blue 6.5 - 7   heated to improve color always   excellent Care should be taken due to Tanzanite's relative softness. Avoid ultrasonic and steam cleaners. Avoid sudden temperature changes and rough handling.   H
  Tanzanite - Natural Green   6.5 - 7   heating n/a n/a   n/a Care should be taken due to Tanzanite's relative softness. Avoid ultrasonic and steam cleaners. Avoid sudden temperature changes and rough handling.   H
  Tanzanite - Natural Golden 6.5 - 7   no treatment n/a n/a   Good Care should be taken due to Tanzanite's relative softness. Avoid ultrasonic and steam cleaners. Avoid sudden temperature changes and rough handling.    
  Thulite Norwegian 6-6.5   Coated To enhance the durability and appearance commonly   Good Avoid abrasives, ultrasonic, solvents and heat.   C
  Tiger Iron 6.5 to 7   None N/A N/A   N/A Normal Care. Avoid heat, chemicals, ultrasonic and steam cleaners.   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   TCF (Thermal color fusion) to add color always   fair TCF process creates a hard, scratch-resistant ceramic layer that can withstand ultrasonic, magnetic pin, and acid-bath cleaning methods and also hold up under cast-in-place techniques. He also says the treatment contains no radiation and is not harmful to the environment.   C
  Topaz - Electric Blue  8   heated to produce to blue color usually   excellent Normal Care   H
  Topaz - Electric Blue  8   irradiated to produce to blue color usually   excellent Normal Care   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   CVD coated to add color commonly   very good Avoid repolishing, scratching or abrading - color coating may be chipped or scratched off.   CVD
  Topaz - Northern Lights Mystic  8   CVD coated to add color commonly   very good Avoid repolishing, scratching or abrading - color coating may be chipped or scratched off.   CVD
  Topaz - Ouro Preto Diamond- Cut  8   n/a n/a n/a   n/a n/a   n/a
  Topaz - Prism Blue 8   CVD Coated to add color commonly   very good Avoid repolishing, scratching or abrading - color coating may be chipped or scratched off.   CVD
  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 to improve color rarely   stable Normal Care   H
  Tourmaline - Australian Black 7 to 7.5   Heated to add color always   very good   Normal Care. Avoid heat, chemicals, ultrasonic and steam cleaners.   n/a
  Tourmaline - Pink 7 to 7.5   Heated to add color always   very good   Normal Care. Avoid heat, chemicals, ultrasonic and steam cleaners.   n/a
  Turkizite   6.5 - 7.0   no treatment n/a n/a   Good Avoid abrasives, ultrasonic, solvents and heat.   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   stabilization, Zachery process to improve durability and appearance always   very good Normal Care. Avoid heat, chemicals, ultrasonic and steam cleaners.   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   impregnated, waxed/oiled to improve color and luster commonly   poor to fair Avoid hot water, household chemicals, and ultrasonic cleaners.   I, W
  Turquoise - Mojave   5 - 6   dyed/stained to improve color rarely   poor Avoid hot water, harsh household chemicals, and ultrasonic cleaners.   D
  Turquoise - Mojave   5 - 6   stabilized to improve durability commonly   good Avoid hot water, harsh household chemicals, and ultrasonic cleaners.   S
  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   no treatment 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 To enhance color n/a   n/a Avoid harsh abrasives and strong light.    n/a
  Zircon - White 6.5 - 7   no treatment n/a n/a   n/a Avoid abrasives, ultrasonic, solvents and heat.    n/a
  Zirconia - Swarovski - All colors 8   Thermal Color Fusing to improve color usually   good Normal Care    TCF