The prepared gemstones are called cabochons or cabs. Stones with these qualities are most frequently cut en cabochon: opalescent, asteriated, chatoyant, and iridescent. A cab's back is normally flat, but an artisan might hollow the back to make the stone lighter.
You can see beautiful cabs done by artisan Roger Crow at: CabNFever
Digital Gem Scale, Personal Lab Equipment, Weigh Carats
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