7mm Natural Pearl Solitaire Necklace

This gorgeous, 1950s, 7mm vintage pearl was removed from an estate ring and made into a solitaire necklace. 18" box link chain is gold-toned, but one piece of the closure is marked "925" so I'm guessing it is gold-plated sterling or 10-14k gold with mixed metal loops at the end. It is non-magnetic except the clasp. (I replaced the clasp with non-allergenic, gold-plated steel - see last photo) Priced as if plated - just in case.