This is an authentic MIKIMOTO 18K White Gold Diamond Black South Sea Cultured Pearl 11.5mm Twist Ring 51 5.75. The ring is crafted of 18 karat white gold and features a 11.5mm black South Sea cultured pearl on a pave set diamond band, approximately .28 total carat weight. Follow this item for alerts. Mikimoto is a registered trademark of Mikimoto. FASHIONPHILE is not affiliated with Mikimoto.