Fine Mikimoto Akoya and Tahitian Pearl Diamond Necklace Consign Now DeptJewelrySize7mm and 11mm Length 17 in. Fine Mikimoto 7mm Akoya White Pearl and 11mm Tahitian Pearl Diamond Necklace, with signature Mikimoto 18k white gold and seed pearl clasp; with original Mikimoto faux suede envelope and box. Length 17 in. Please note that this auction has ended. Click here for an overview of this auction.