Cymophane is a mineral that belongs to the group of chrysoberyl gemstones. Also referred to as cat's eye or chrysoberyl cat's eye, cymophane is known for its chatoyancy, which is a unique optical effect that creates a narrow band of light shining across its surface in a way that resembles the slit of a cat's eye. If you're looking for synonyms for cymophane, you may come across terms such as chatoyant chrysoberyl or catseye chrysoberyl. These names essentially describe the same gemstone, and they all highlight its defining characteristic of chatoyancy, which is highly prized in the world of gemstones.