It is an obsidian born by the earth's volcanic activity, but we will change the color according to the ingredients it contains. Here is purple color emerges when hit by light. It is a mysterious work by which you can see the glow from the inside by taking a light. Natural stone: obsidian String: silk thread (slide adjustable) Decoration: 14 kgf · Smoky Quartz Adjustment section: Smoky Quartz 【About Silk】 Most of MARU's 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.