multicolourgems:Most of the gemstones on the tray are chrysoberyls, and possibly a few alexandrites
multicolourgems:Most of the gemstones on the tray are chrysoberyls, and possibly a few alexandrites – all from Tunduru, Tanzania. The bottom left is cats’eye and the one above is vanadium chrysoberyl. We always process the alexandrites first because they represent the highest value, by using a fiber optic directed across the stone and perpendicular to the line of sight to search for inclusions and cracks which help determine the orientation of the cut. -- source link
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