This is an authentic TIFFANY Platinum Diamond .18ct Solitaire Engagement Ring 51 5.75. The ring is crafted of platinum and features a single round brilliant cut diamond, approximately .18 carat, with E color and a VVS2 clarity grade, in the signature Tiffany setting. Follow this item for alerts. Tiffany is a registered trademark of Tiffany. FASHIONPHILE is not affiliated with Tiffany.