18ct Yellow Gold Blue John 1.47 Carat Diamond Ring. R469. This elegant dress ring features a stunning domed oval cabochon of rare Blue John stone that has been sourced directly from Castleton, Derbyshire. The stone is encased by an exquisite 18ct yellow gold setting and surrounded by a double halo of 1.47 carat pave diamonds. The ring is completed by a classic 18ct yellow gold band. 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 Blue John pieces online and in store to complement this necklace. All articles purchased from C W Sellors are lovingly and securely dispatched with our elegant jewellery packaging.