Chrysoberyl
Chrysoberyl is an unusual gemstone and gem quality specimens are very hard to find. Chrysoberyl cat's-eye (or cymophane) shows chatoyancy due to needle like inclusions. Alexandrite is the rare variety of chrysoberyl which displays colour change optical properties. It is a particularly hardwearing stone and therefore ideal for jewellery. Hardness: 8.5 (Mohs).
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