18ct White Gold 0.10ct Diamond Blue John Round Stud Earrings, E1997. These delicate stud earrings boast two stunning round pieces of rare Blue John stone that has been directly sourced from Castleton, Derbyshire. The stone is placed within an exquisite 18ct white gold setting and surrounded by dazzling 0.10 cts of brilliant cut diamonds, creating a breathtaking sparkle. 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 these earrings. All articles purchased from C W Sellors are lovingly and securely dispatched with our elegant jewellery packaging.