1, Obsidian is valuable because of its unique characteristics. Because of its uniqueness and limited production, it is more rare and precious, so its cumulative price is higher. This is because obsidian has the flash characteristics of gem materials, such as luster and cat's eye effect, which requires high condensation in jewelry industry. The price of obsidian depends on its quality, color and size, and high-quality obsidian will be expensive.

2. Obsidian application and jewelry. Obsidian is the original stone of obsidian. Obsidian is widely used in jewelry making, such as necklaces, bracelets, rings and so on, because its crystal luster and cat's eye effect add a unique crystal visual effect to jewelry. In addition, obsidian is also used to make handicrafts and decorations, because some of its appearances are very attractive.

3. Obsidian is volcanic glass formed by rapid condensation of acidic lava with high viscosity during volcanic eruption. The formation of obsidian requires three basic conditions: volcanic eruption, acid lava and rapid condensation. Obsidian is black or grayish brown, but brown and gray can also be seen, with obvious glass luster and spiral fracture of shells. The chemical composition of obsidian is mainly silicon dioxide, the content is 70%~75%, the Mohs hardness is close to 5, and the material is hard. At the high temperature of 1200℃, the volume of obsidian can expand more than 3 times, and the structure can still remain stable. The main producing areas are in America, such as Hawaii and Yellowstone National Parks in the United States, and Lipari Islands in Japan, East Africa and Italy. Obsidian's black and bright glass luster can be used to make decorations, daily necessities, ritual vessels and funerary objects, and its sharp edges can be used to make tools and weapons.