This is an authentic TIFFANY Platinum Diamond .31ct Solitaire Engagement Ring size 51 or 5.75. The ring is crafted of platinum and features a solitaire round brilliant cut diamond weighing approximately .31 carat, with F color and VS1 clarity. Follow this item for alerts. Tiffany is a registered trademark of Tiffany. FASHIONPHILE is not affiliated with Tiffany.