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 and features a diamond approximately .01 total carat weight. Follow this item for alerts. Tiffany is a registered trademark of Tiffany. FASHIONPHILE is not affiliated with Tiffany.