11-12mm Black Cultured Pearl Necklace With 14kt White Gold Clasp. 18" - Our necklace gleams with the enigmatic luster of midnight-hued 11-12mm cultured freshwater pearls. Offered in six lengths ranging from the neckline-skimming princess style to extra-long opera lengths that can be worn knotted or doubled up. Necklace is finished with a 14kt white gold ball clasp.