Green Obsidian 12mm Bracelet Inner circumference: 16.5 cm Size adjustments are available. Please let us know your desired size. (Removed stones will be sent with the bracelet.) Size upgrades are free up to an inner circumference of 18 cm. Green Schiller Obsidian, known in Japanese as "kokuyoseki" (black曜石), is a type of volcanic rock. It is said that obsidian is formed when lava cools rapidly, and it has properties closer to glass than a hard mineral. Since ancient times, obsidian has been known as a mystical stone and was believed to have the power to see into the future. Even today, obsidian is considered a power stone with the ability to see the essence of things and the future, and it is mainly expected to be a talisman for business and other endeavors. It is also said to have strong protective power and is popular as a talisman for warding off evil and bad luck. #PowerStone #PowerStoneBracelet #NaturalStone