18ct White Gold Blue John 0.25 Carat Diamond Pear Shoulder Ring. R1010. This elegant 18ct white gold ring features a stunning pear shaped hand carved Blue John stone that has been sourced directly from Castleton, Derbyshire. Sparkling diamonds totaling 0.25 carats embellish the shoulders and frame the stone. 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.