Cartier Emerald 18k Tri-Color Gold 3 Stack Band Ring Size EU 48-US 4.5. This is a authentic tri-color gold ring by Cartier, is crafted from solid 18k yellow, rose and white gold with a high polished finish, it is in the form of three slim stacked rings joined together forming a 3.5mm wide band and a round cut bezel set vibrant green emerald gemstone in the front center. It is simple and elegant and has the designer hallmark, serial number, ring size and metal content. Material: Solid 18k yellow rose and white gold. Hallmark: Cartier 750 48 1995 D42398 Measurements: Front: 6mm x 6mm Band is: 3mm wide Ring Size: US: 4.5 European: 48 Emerald: 0.20 total carat weight Weight: 4.6 grams Stock#: 54468