This is an authentic CARTIER 18K Yellow Gold Diamond Tank Francaise Ring size 51 or 5.75. This magnificent ring is crafted of 18 karat yellow gold and features a Tank de Cartier style band set with edges and vertical lines of round brilliant cut diamonds with a total approximate carat weight of .41 carats. Enjoy this ring for the iconic style of Cartier! Follow this item for alerts. Cartier is a registered trademark of Cartier. FASHIONPHILE is not affiliated with Cartier.