Cat’s Eye represents a gemstone polished into a cabochon that demonstrates a narrow band of concentrated light going over the width of the stone. This effect, known as chatoyancy, or cat’s eye result, is caused by inclusions of fine, slim parallel mineral fibres in the gemstone that reflect light in a single strip. Of all the gemstones that exhibit cat’s eye, Chrysoberyl Cat’s Eye is the best identified. Chrysoberyl has the strongest and most distinct cat’s eye outcome of all gemstones. Though several different gemstone kinds exhibit a cat’s eye effect, only Chrysoberyl’s cat’s eye experiences the privilege of having the name “Cat’s Eye” without any prefix. Whenever the word “Cat’s Eye” is used, it refers to Chrysoberyl cat’s eye by default, except otherwise specified.