Item #: 717363 This is an authentic TIFFANY Platinum Diamond .18ct Solitaire Ring size 51 or 5.75. This lovely ring is crafted in fine platinum and features a round brilliant diamond solitaire in a classic Tiffany setting weighing a total of approximately .18 total carat weight. Follow this item for alerts. Tiffany is a registered trademark of Tiffany. FASHIONPHILE is not affiliated with Tiffany.