Sterling silver blue john single heart ringr673 this feminine ring features highly polished hand carved blue john sourced directly from the treak cliff cavern in castleton the beautiful stone is inlaid in a solid sterling silver solidheart frame the ring would make the perfect addition to any gemstone lovers collection all our blue john jewellery is designed and crafted within our very own workshops in derbyshire where a team of skilled craftsmen transform the natural blue john into thes