This is an authentic TIFFANY Sterling Silver Diamond 1837 Circle Lock Necklace. This charming necklace features a sterling silver chain and circle lock pendant engraved with the signature Tiffany 1837 logo. This is a lovely necklace with an unforgettable style, only from Tiffany! Follow this item for alerts. Tiffany is a registered trademark of Tiffany. FASHIONPHILE is not affiliated with Tiffany.