Item #: 840822 This is an authentic CARTIER 18K White Gold Diamond Flat C Ring size 51 or 5.75. This open ring is constructed from 18 karat white gold and lined with a half circle of sparkling channel-set round brilliant cut diamonds, approximately .32 total carat weight. Follow this item for alerts. Cartier is a registered trademark of Cartier. FASHIONPHILE is not affiliated with Cartier.