Item #: 1027519 This is an authentic TIFFANY Platinum Diamond .18ct Harmony Engagement Ring size 51 or 5.75. The ring is crafted of platinum and features a center round brilliant cut diamond weighing approximately .18 carat. The ring also features additional round brilliant cut diamonds on the band, approximately .22 total carat weight. Follow this item for alerts. Tiffany is a registered trademark of Tiffany. FASHIONPHILE is not affiliated with Tiffany.