What does sg th mean on a ring?

The marking "SG TH" on a ring typically indicates that the piece is made of sterling silver, with "SG" standing for "silver gold" or "silver" and "TH" often representing the manufacturer's initials or a specific design code. It is important to verify the exact meaning from the manufacturer or jeweler, as markings can vary. Overall, it signifies a combination of metals and quality standards typical in jewelry.