Welcome to the family of gemstones. You may wonder how do these gemstones classify within these 16 different families? It is actually based on their chemical composition. Chemical composition is comprised of these 3 characteristics: specific gravity Mohs hardness and index of refraction. Not the most exciting explanation since our passion for gemstones generally comes from their capability to refract light and a color which is pleasing to our own individual taste. Please note the provided color swatches could vary.