Item #: 1377244 This is an authentic TIFFANY 18K Yellow Gold Diamond Atlas Pierced Key Pendant Necklace. This charming key pendant necklace is crafted of 18 karat yellow gold in the design of a key with Roman numerals and round brilliant cut diamonds, approximately .02 total carat weight. Follow this item for alerts. Tiffany is a registered trademark of Tiffany. FASHIONPHILE is not affiliated with Tiffany.