Contains radioactive elements. Some radioactive elements, such as polonium, cobalt and radium, often coexist with gold mines. In the process of mining, smelting and making gold jewelry, it is inevitable that a small amount of radioactive elements will remain and be mixed into it. When wearing these gold jewelry containing radioactive elements, the skin in contact with them will be damaged by radiation for a long time, causing radioactive jewelry disease, and in severe cases, radiation cancer.