Cartier 2.75ct Diamond 18k YGold 14mm Wide Open Band Ring Size 53-US 6. This authentic wide band ring is by Cartier, it is crafted from 18k yellow gold and has a 14mm wide form with open space between columns around the entire band, all set with round cut diamonds. The center of the band has a concave shape and it is signed by the designer with the serial number ring size and metal content. Material: 18k yellow gold Diamonds: 2.75 total carat weight Color: G Clarity: VS1 Ring Size: US: 6 European: 53 Measurements: band is: 0.55" wide x 0.10" thick Weight: 11.8 grams Stock# 57295