What does 90-HL stamped marking mean on a ring?

The "90-HL" stamped marking on a ring typically indicates that the ring is made of 90% gold and is likely a form of gold alloy, where "HL" may refer to the manufacturer or specific alloy type. This marking suggests the ring has a high gold content, which is often associated with quality and value. Always verify with a jeweler to confirm the authenticity and specifics of the marking.