Mikimoto 18ct White Gold 7-7.5mm White Grade A Pearl Stud Earrings. PES 701 W. 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. These classic Mikimoto earrings feature two uniform white Grade A cultured pearls 7-7.5mm in size. The earrings are finished with 18ct white gold post and butterfly style fastenings for secure, easy wear and would be a beautiful addition to any jewellery lovers collection. These earrings come beautifully packaged in a unique Mikimoto presentation box with certificate of authenticity.