18ct White Gold Blue John Diamond Twisted Shoulder Ring. R1009. This elegant 18ct white gold ring features a stunning, perfectly round hand carved Blue John stone that has been sourced directly from Castleton, Derbyshire. Sparkling diamonds totalling 0.13 cts embellish the shoulders of this delicate piece. 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 ring. All articles are lovingly and securely dispatched with our elegant jewellery packaging.