Item #: 589421 This is an authentic CARTIER 18K White Gold 4mm Happy Birthday Band Ring size 46 or 3.75. The ring is crafted of 18 karat white gold and features the double C Cartier logo engraved throughout the band. This is an iconic ring with the timeless style of Cartier! Follow this item for alerts. Cartier is a registered trademark of Cartier. FASHIONPHILE is not affiliated with Cartier.