The technical term for the cat's eye effect is chatoyancy, derived from the French for ‘eye of the cat’. It is from the family of chrysobery. Cat’s Eye is one of the most unique looking gemstones available; Jewellery made with Cat’s Eye looks Mystical. Although other minerals such as tourmaline, scapolite, corundum, spinel and quartz can form "cat's eye" stones similar in appearance to cymophane, the jewelry industry designates these stones as "quartz cat's eyes", or "ruby cat's eyes" and only chrysoberyl can be referred to as "cat's eye".
Mohs hardness 8.5.
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