Vintage Blue 9mm Vintage Blue Japanese Saltwater Akoya Cultured Pearl Solitaire Ring- Sterling Silver Sz 7 Saltwater Akoya Cultured Pearl Solitaire Ring- Sterling Silver Sz 7This is a unique retro blue gray Japanese saltwater akoya cultured pearl & sterling silver solitaire ring. The pearl is 9mm round. It has good luster with light rosy overtones. It is a blue gray color. It is set in solid sterling silver with a modernist design. It is stamped "SILVER" for sterling silver. US size 7. From 1950's 1980's. All pearls are truly vintage and have only been lightly cleaned.