The chrysoberyl species consists of three very different gemstones that bear no resemblance to aone another. Each stone possesses a quality that makes it desirable and valuable: one changes its colour; another is chatoyant(with a cat's-eye effect) and the last one is a brilliant transparent gem. Together, they provide jewelry makers with an interesting and challenging choice of stones.  They are the ALEXANDRITE, CHRYSOLITE, CYMPHANE(Chrysoberyl cat's-eye).