18kt White Gold, Green Tourmaline and Diamond Necklace Consign Now DeptJewelrySizeLength 18 in. 18kt White Gold, Green Tourmaline and Diamond Necklace, set with 18 graduated cushion shaped bezel set tourmalines, approximate total weight of 12 cts, surrounded by prong set, brilliant cut diamonds, approximate weight of 6 cts. Length 18 in. Please note that this auction has ended. Click here for an overview of this auction.