Silver blue john marcasite marquise double row bead ring r814 this simple and stylish ring boasts a marquiseshaped cabochon of blue johnstone that has been sourced directly from the treak cliff cavern in castleton the stone has been placed within an exquisite sterling silver setting encrustedwith dazzling marcasite bringing a sophisticated sparkle to the piece the ring is completed by four split shoulders and aclassic sterling silver band all our blue john jewellery is designed and cra