What does gm137 mean on your ring?

The "gm137" on a ring likely refers to the specific metal alloy used in its construction, with "gm" possibly indicating "gold metal" and "137" denoting the purity or karat of the gold. This could imply that the ring is made of a gold alloy that has a certain percentage of pure gold. It's important to check with the jeweler or manufacturer for the exact meaning, as markings can vary.