18ct Yellow Gold Blue John 0.10ct Diamond Cushion Necklace, P992C. This stunning 18ct yellow gold necklace features a beautiful cushion shaped cabochon of rare Blue John stone that has been sourced directly from Castleton, Derbyshire. The stone is placed within an 18ct yellow gold setting and embellished with a sparkling brilliant cut diamond, totalling 0.10cts, set on the bail. The pendant is completed by an 18\" 18ct yellow gold chain.  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 and Diamond 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.