13mm x 15mm and 13mm x 15.6mm White South Sea Pearl Necklaces Consign Now DeptJewelrySizeLength 16 in. Fine 13mm x 15mm White South Sea Pearl Necklace, composed of 31 graduated pearls with 14k yellow gold clasp. Length 16 in. 13mm x 15.7mm White South Sea Pearl Necklace, composed of 31 graduated pearls with 14k white gold clasp. Length 16 in. Please note that this auction has ended. Click here for an overview of this auction.