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 small diamonds with a total approximate carat weight of 0.02 carats. Follow this item for alerts. Tiffany is a registered trademark of Tiffany. FASHIONPHILE is not affiliated with Tiffany.