Black Tourmaline 10mm Bracelet Inner circumference: Approximately 16 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. It looks similar to onyx, but when viewed up close, it has a unique luster on the surface. You can see distinctive indentations and what appear to be scratches. Its Japanese name is "Denkiseki" (electric stone), and it is known for actually carrying static electricity. In Japan, minerals that actually carry static electricity and have both positive and negative poles are called "Denkiseki," highlighting the electricity this stone emits. Since ancient times, it has been said to have been used as a tool to ward off illness, primarily by various ethnic groups. This mineral contains many metal ions, so it is believed to have the effect of generating negative ions. It is one of the stones that is attracting attention in health goods and other products even today. The electricity emitted by tourmaline is said to neutralize or reduce electromagnetic waves, which can have a negative impact in modern society from computers, mobile phones, etc. It is now a famous power stone, designated as the birthstone for October. #PowerStone #PowerStoneBracelet #NaturalStone