Chrysoberyl – Natural, Cabochon, Yellow

Chatoyant or "cat's eye" chrysoberyl gems are also known as cymophanes. Fine silk inclusions (very fine threads of crystals) make its cat's eye effect one of the sharpest of all gems when properly cut. "Cymophane" by Gemshare. Licensed under CC By-SA 3.0.

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Credit: Gemshare