The letters RSG stamped on a ring means that the ring was preassembled. Any gems in the ring that is stamped RSG have not been certified.
It’s the brand of the ring
probably a manufacturer stamp
The letters "LS" stamped inside a ring typically stand for the manufacturer or jeweler's mark, indicating the company or individual who made the ring. It could also be a quality mark, indicating the type of metal used in the ring, such as sterling silver. Additionally, LS could be the initials of the designer or the person for whom the ring was made.
What does the TM mean
Marks stamped on a ring may tell you the manufacturer as well as the composition and metal quality.
"STERLING" stamped on a ring indicates that the ring is made of sterling silver, while letters stamped on the inside of a ring could represent the manufacturer's mark, the metal purity mark, or any personalization done to the ring. It is common for jewelry pieces to have these stamps for identification and quality assurance purposes.
L stamped inside a ring
what does thailand mean stamped in a ring
It is probably the abbreviated manufacturer name Sumthing Special in Canada. I have a ring with the same letters.
What does 18kHGA mean stamped in a ring
what does Thailand mean stamped in a ring
From what I understand some jewelers stamped in the ring size!