Mikimoto 18ct White Gold 7-7.5mm Grade A+ Akoya Pearl Chain Necklace. PPM 25 W3. Over a century ago, Kokichi Mikimoto succeeded in creating the world's first cultured pearl. His quest for perfection and his love for these pure, lustrous gems of the sea were the guiding forces that built the house of Mikimoto. This elegant Mikimoto necklace features exquisite white Grade A+ Akoya cultured pearls 7-7.5mm in size. These classic pearls sit gracefully on a three row 18ct white gold chain and would be a beautiful addition to any jewellery lovers collection. The necklace comes beautifully packaged in a unique Mikimoto presentation box with certificate of authenticity.