White and Tahitian South Sea Pearl & Diamond Lariat Necklace Consign Now DeptJewelrySize12mm - 16.4mm Length 20 in. 12mm – 16.4 mm White and Tahitian South Sea Pearl & Diamond Lariat Necklace, comprising white and gray pearls, 18k white gold roundels and 18k white gold and diamond clasp. Length 20 in. Please note that this auction has ended. Click here for an overview of this auction.