Peter stone is a rare gem with cat's eye effect, and it is a collection of timely, chalcedony, agate and opal formed by the late silicification of gangue minerals. It is very precious, and it is better than stone by comparison.

Tourmaline is the handicraft name of Tourmaline, and it is a gem-grade variety in Tourmaline. Tourmaline has dozens of colors, among which colorless, pink, rose red, green, yellow and black are more common.