1. Before the jewelry leaves the factory, the necessary marks should be printed on the jewelry rack. These marks include: manufacturer's code, purity, material, weight of the main stone inlaid with jewelry and marks (diamonds above 0. 10 carat).

2. Diamond jewelry will show the weight of the diamond and the logo of the merchant. Some diamond rings have the logo at the beginning of D+, and D stands for diamond (the initials of English diamond).