Meow. The optic phenomenon called chatoyancy -- the forming of a cat's eye in a gem-- is so rare and so amazing to behold that for centuries, ancient civilizations believed that gems with this property were bewitched. The cat's eye is formed by needle-like inclusions called rutiles. This is a remarkable gem in a delicate, astral gray tone with a sharp, clear eye. It will make an exceptional (and mysteriously alluring) ring or pendant. Call us for your free design consultation today! Gemstone Details