Beautiful TAHITIAN Black/Gray Cultured Pearl Necklace. The item Tiffany & Co. Please look at all photos. Please see photos with ruler. Tiffany & co. iridesse 8-9mm black/gray tahitian pearl 18k yellow gold necklace this item can be shipped to united states. Pearl Size 8.0-9.0MM. IRIDESSE 8-9MM Black/Gray TAHITIAN Pearl 18K Yellow Gold Necklace.