Item #: 63609 This is an authentic TIFFANY & CO Sterling Silver Black Onyx Toggle Necklace. This stunning necklace is crafted of round, perfectly smooth beads of black onyx with a bar and hoop clasp in sterling silver. This is a marvelous necklace with the classic style only from Tiffany & Co! Follow this item for alerts. Tiffany is a registered trademark of Tiffany. FASHIONPHILE is not affiliated with Tiffany.