1: We provide customers with various sizes of natural stone bracelets, giving dear customers more choices. Each type of stone is carefully selected by us. As stones are natural and unique, the colors and patterns on the stones may vary slightly. We apologize for any inconvenience caused. 2: Storage of stones: Clean regularly with clean water to maintain a clean state, which is the purest state of crystal stones. Only in their natural state can they exert their best energy.