What does 10k sa1 mean on inside of ring?

The marking "10k SA1" on the inside of a ring indicates that the ring is made of 10-karat gold, which means it contains 41.7% pure gold mixed with other metals for strength and durability. The "SA1" could be a manufacturer's mark, indicating the specific jeweler or brand that produced the ring. This marking helps buyers identify the quality and authenticity of the gold used in the piece.