Victorian 18ct Gold Opening Ring With Locket Compartment

A rare fully hallmarked 18ct75% pure gold (or 750 parts pure gold and 250 parts other metals) gold ring that was made in 1856 in London. It looks like a plain signet ringA ring with a central plaque on which one’s initials, a seal, or a crest is engraved. but the top opens to reveal a secret compartment. It can be worn by either sex.