Item #: 712069 This is an authentic TIFFANY 18K Yellow Gold Diamond 1837 Circle Pendant Necklace. This one-of-a-kind necklace features a circular 18 karat gold pendant with a single diamond in the center, approximately .05 carat weight. Follow this item for alerts. Tiffany is a registered trademark of Tiffany. FASHIONPHILE is not affiliated with Tiffany.