The most famous and valuable cat's eye gemstone is chrysoberyl cat's eye. In fact when the term cat's eye is used alone in the gem trade, it always refers to chrysoberyl cat's eye. All other types of cat's eye gems require an additional varietal designation, such as cat's eye apatite. Chrysoberyl cat's eye is so highly regarded due to its excellent hardness (8.5 on the Mohs scale), superb luster and remarkably sharp cat's eye effect.
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