Hokkaido Black Silica 10mm Bracelet Black silica is a natural stone that is attracting attention mainly in the health field because it contains many natural minerals and has excellent far-infrared radiation characteristics. [Specifications] Bead size: Approximately 10mm Inner diameter: Approximately 17.5cm (±5mm) * Size adjustment available. We will re-estimate the price depending on the size, so please let us know in the comment section. This is well-known black silica. It is a type of silica stone formed from diatomaceous earth that has accumulated on the seabed over a long period of time and then fossilized, and it has turned black due to carbon such as graphite. For this reason, its Japanese name is graphite silica. It is a popular natural mineral that is also used in hot springs, rock bathing, water purification, and agriculture. Black silica, which contains various minerals, is said to emit far-infrared rays even at room temperature, and its effects are said to last semi-permanently. The texture of the stone is not the glossy type like onyx, but rather has a matte impression. The surface is not just black, but has a deep color. Since it was designated as a statutory mineral in 2010, it can no longer be mined freely. Therefore, it is said that its rarity value will increase even further in the future. #HealthJewelry #Terahertz #Hokutolite #Germanium #Badgastein