Natural stone: Moonstone String: silk thread (3.5cm adjustable) Adjustment section: 925 Silver 【About Silk】 This work uses silk. It is a delicate silk because it is a natural fiber, but you can use it for a long time by properly cleaning it. If you inhale sweat, please strike gently with a stiffly towel etc and drop it. Please be careful about handling as it is sensitive to water wetting and rubbing. After carefully place in a well-ventilated place, please keep away from direct sunlight.