Obsidian (Tokachi Stone) is a black glass formed when highly viscous magma cools rapidly after being ejected from a volcano. Its gemstone name is obsidian. Tokachi Stone is believed to grant the ability to see the essence of things and foresee the future, and to protect its owner. Product of Tokachi, Hokkaido. It is a rare stone found in only a few places in Japan. Reddish-brown patterns (Red Tokachi Stone) are also mixed in. Total weight: Approximately 1.8kg Stone size: Approximately 5cm to 7cm. (Measured at the longest point) If you purchase two obsidian stones currently on sale, you will receive a 300 yen discount on the total amount, and a 500 yen discount for purchasing three. Please let me know before you purchase. As it is a natural stone, there may be cracks, chips, and stains.