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Only a few gems exhibit such exceptional light reflectance: cerrusite, sphalerite, . For every stone over.91 ct, there is a corresponding gemstone below.91 ct to.
Gem, Gems, gemstone birthstone - Gemology which covers almost the entire precious, semi- precious and organic gems available in the Universe. Astrology and. If you wish to use my writings. It is not a single crystal like amethyst or citrine. Hoop earrings are simply earrings in the shape of a hoop or circle. Chatoyancy is a special optical property that is highly prized by gem collectors. Learn more about sapphire by clicking. Smectite a group of clay minerals.