Silver blue john marcasite marquise beaded shoulder ring r753 this simple and stylish ring boasts a delicate oval shaped cabochon of blue john stone that has been sourced directly from treak cliff cavern in castleton the stone has been placed within an exquisite sterling silver setting detailed with dazzling marcasite on the shoulders bringing 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 wit