This is an authentic TIFFANY Platinum Diamond .31ct Solitaire Engagement Ring size 46 or 3.75. The ring is crafted of platinum and features a single prong-set round brilliant cut diamond, approximately .31 carat, with I color and VS1 clarity grade. Follow this item for alerts. Tiffany is a registered trademark of Tiffany. FASHIONPHILE is not affiliated with Tiffany.