Item #: 1621057 This is an authentic TIFFANY 18K Yellow Gold Diamond Black Onyx 16mm T Circle Pendant Necklace. The necklace is crafted of 18 karat yellow gold and features black onyx and diamond accents weighing approximately .05 total carat weight on a circular pendant. Follow this item for alerts. Tiffany is a registered trademark of Tiffany. FASHIONPHILE is not affiliated with Tiffany.