This is an authentic TIFFANY Titanium 4mm Narrow 1837 Ring size 51 or 5.75. The ring is crafted of black titanium and features the 1837 logo engraved along the band. This is an excellent ring with the timeless style of Tiffany. Follow this item for alerts. Tiffany is a registered trademark of Tiffany. FASHIONPHILE is not affiliated with Tiffany.