14kt yellow gold Vintage "Cat's Eye" chrysoberyl cuff links. Gems that are called "Cat's Eye" are rare, and exhibit a sharp band of light that resembles the slit of the eye of a cat. The effect in gemological terms is called "chatoyancy". Cat's Eye chrysoberyl was treasured in Asia before the birth of Christ, and became quite well-known in Rome by the end of the First Century.