What 925GM28 mean on a bangle?

The marking "925GM28" on a bangle typically indicates that the piece is made of sterling silver, with "925" signifying that it contains 92.5% silver. The "GM" could represent the manufacturer's initials or a specific design line, while "28" might refer to a specific model or batch number. This marking helps identify the quality and authenticity of the metal used in the jewelry.