Generally, thousands of gold jewelry will have XX thousands of gold lettering, suggesting two messages. First, the gold purity of this jewelry reaches the purity of thousands of gold, 99.9%; Second, which company is the representative. YH is a manufacturer's code name. Usually it is the initials of the seller (that is, Mengmeidi), but it is obviously not. It is the code name of the manufacturer who has supplied the seller for so long. Generally, the seller will not tell us which one it is. Anyway, if there is a problem, the seller will return it to the supplier according to this code. This has little impact on consumers and generally does not affect consumers' rights and interests.