Cat's Eye Stone is a unique gemstone known for its striking optical phenomenon called chatoyancy, which resembles the slit eye of a cat. This effect occurs when light reflects off the stone's fibrous inclusions, creating a narrow band of light that moves across the surface. The most common variety is Chrysoberyl, but other minerals can also exhibit this feature. The stone is often used in jewelry, such as rings and pendants, and is valued for its beauty and rarity. In addition to its aesthetic appeal, Cat's Eye Stone is believed by some to possess protective properties, making it a popular choice for those interested in metaphysical practices.