This is an authentic TIFFANY Platinum Diamond .29ct Princess Cut Engagement Ring size 51 or 5.75. The ring is crafted of platinum and features a single prong-set princess cut diamond, approximately .29 total carat weight, with E color and VS2 clarity grade. Follow this item for alerts. Tiffany is a registered trademark of Tiffany. FASHIONPHILE is not affiliated with Tiffany.