This is an authentic TIFFANY Platinum Diamond .22ct Solitaire Engagement Ring size 51 or 5.75. This lovely ring is crafted of a 2mm platinum band that holds a round brilliant-cut diamond solitaire with approximately .22 total carat weight with H color and VS1 clarity. Follow this item for alerts. Tiffany is a registered trademark of Tiffany. FASHIONPHILE is not affiliated with Tiffany.