How can I tell if Mikimoto pearls are vintage?

Vintage Mikimoto pearls are set with cream or white pearls. Colored pearls are a modern addition. All Mikimoto pearl jewelry includes marks on the back or inside of the piece that is either the Mikimoto name, an “M” logo or the outline of an oyster. In addition, strands of pearls will have a dangling “M” charm. Mikimoto stores and authorized retailers will also appraise and issue a certificate of valuation for any Mikimoto piece. Find a variety of expertly vetted Mikimoto pearl jewelry on 1stDibs.