18ct White Gold Blue John 0.12ct Diamond Oval Cluster Ring, R1152. This unique 18ct white gold ring features a stunning oval hand carved cabochon of the finest Blue John stone, which has been sourced directly from Castleton, Derbyshire. The gemstone is encompassed by a sparkling halo of brilliant cut diamonds, totalling 0.12cts. Designed perfectly for everyday wear, this gemstone set piece would make the perfect engagement ring featuring a rare British gemstone.  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 matching Blue John and diamond pieces online and in store. All articles purchased from C W Sellors are lovingly and securely dispatched with our elegant jewellery packaging.