This is an authentic TIFFANY Sterling Silver Diamond 1837 Circle Lock Necklace. The necklace is crafted of sterling silver and features a circle lock pendant engraved with the signature Tiffany 1837 logo set with a diamond weighing approximately .01 carats. Follow this item for alerts. Tiffany is a registered trademark of Tiffany. FASHIONPHILE is not affiliated with Tiffany.