Item #: 266222 This is an authentic CARTIER 18K White Gold Happy Birthday 4mm Band size 51 or 5.75 This ring is designed in 18 karat white gold and has the Cartier logo engraved all around. This is an elegant ring with a distinctive look, only from Cartier! Follow this item for alerts. Cartier is a registered trademark of Cartier. FASHIONPHILE is not affiliated with Cartier.