Sado's Akadama Stone is a famous stone produced in Sado City, Niigata Prefecture. It is a mineral formed by the bonding of quartz and iron oxide under high temperature and pressure. When polished, it is a hard, crimson rock that shines beautifully and is counted as one of Japan's three major famous stones. Characteristics of Sado Akadama Stone: Color: Crimson, with a transparent luster when polished. Hardness: Very hard, with a hardness of 6.5 to 7.0. Origin: Primarily from the Akadama area of Ryotsu City (now Sado City), Niigata Prefecture. Features: A mineral formed by the bonding of quartz and iron oxide under high temperature and pressure, it has long been believed to "ward off evil" and is considered an auspicious stone. Rarity: Production has decreased since the 1970s, and it is now a rare stone that is difficult to obtain. Uses: As an ornamental stone (famous stone), and also displayed in entryways and alcoves as a protective stone for the home. History of Sado Akadama Stone: Sado Akadama Stone has long been treasured as an auspicious stone, believed to "ward off evil." Records show that it was presented to Toyotomi Hideyoshi. Production has decreased since the 1970s, and it is now a rare stone that is difficult to obtain. Other: Sado Akadama Stone is also collected in Hokkaido, Shizuoka Prefecture, and Toyama Prefecture, but the stone from Sado City is considered to be of the highest quality. Sado Akadama Stone is also popular as a Suiseki (water stone). Sado's Akadama Stone is highly valued by collectors and enthusiasts for its beautiful color and rarity. - Style: Bead bracelet This product is made of natural stone, so there may be some holes! - Size: Approximately 12.7mm, inner circumference 16.5 No returns, refunds, or exchanges! Thank you for viewing.