18ct White Gold 1.51ct Aquamarine Diamond Marquise Ring. FEU-1390.  This elegant 18ct white gold ring features one large 1.51ct marquise cut Aquamarine. The beautiful precious gemstone has been elegantly framed with 0.38cts of brilliant cut diamonds. The shoulders are also embellished with 0.31cts of sparkling diamonds. A perfect addition to any jewellery lovers collection. At C W Sellors, we have an expert team of gemstone and diamond specialists who handpick and grade each jewel to meet our high standards and a team of talented in house designers who combine their talents to bring you our exclusive Precious Gemstone collection. You can find other aquamarine and diamond pieces online and in store to complement this ring. All articles purchased from C W Sellors are lovingly and securely dispatched with our elegant jewellery packaging.