18ct Yellow Gold Blue John 0.24ct Diamond Oval Ring. R1109. This 18ct yellow gold ring features 38 brilliant cut diamonds (total 0.24ct) which are pave set surrounding a hand carved oval Derbyshire Blue John gemstone as the centre piece of this cluster ring. The diamonds extend down each shoulder of the ring adding a luxurious sparkle to this classic design.  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.