Very Fine South Sea Tahitian Pearl Necklace Consign Now DeptJewelrySizeLength 18 in. Very Fine South Sea Tahitian Pearl Necklace, 15mm x 16.8mm, 18kt white gold and diamond clasp set with 288 diamonds totaling 2.80cts, color VS-GH. Length 18 in. Please note that this auction has ended. Click here for an overview of this auction.