Sterling silver blue john marcasite round stud earrings e1634 these exquisite earrings boast two stunning cabochon of rare blue john stone that has been sourced directly from the derbyshire blue john cavern in castleton the stone is placed within an enchanting sterling silver flower design that has been embellished by dazzling marcasite stones giving the earrings a sophisticated sparkle the studs are completed by classic post and butterfly fastenings for easy wear all our blue john jewelle