Mikimoto 18ct White Gold 5.5mm White Grade A Pearl Stud Earrings, PES 501 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 5.5mm Grade A cultured pearls. The earrings are finished with 18ct white gold posts and butterfly style fittings for secure and easy wear. These earrings come beautifully packaged in a unique Mikimoto presentation box with certificate of authenticity.