Item #: 999203 This is an authentic TIFFANY 18K Yellow Gold Diamond 1837 Circle Pendant Necklace. The necklace is crafted of 18 karat yellow gold and features a round pendant engraved with the 1837 Tiffany & Co logo and accented with a single diamond weighing approximately .05 carats. Follow this item for alerts. Tiffany is a registered trademark of Tiffany. FASHIONPHILE is not affiliated with Tiffany.