Silver blue john marcasite triangle ring r820 this elegantring boasts a strikingmarquiseshaped cabochon of rare blue john stone that has been directly sourced from treak cliff cavern in castleton the stone is placed within an exquisite sterling silver diamond setting that has been embellished by dazzling marcasite stones which bring a sophisticated sparkle to the piece the ring is completed by a classic sterling silver band all our blue john jewellery is designed and crafted within our v