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.
Why is chrysoberyl cat's eye so highly esteemed? One reason is that chrysoberyl has superb gemstone characteristics, with a hardness of 8.5 on the Mohs scale. This places chrysoberyl right behind ruby and sapphire as an especially hard-wearing gem, suitable for all kinds of jewelry. Because of its excellent hardness, chrysoberyl takes a good polish and displays superb luster
Cats eyes
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