Sterling silver blue john inlay band ring r003 this simple band ringfeaturesa highly polished rectangular cabochonof fine blue john stone that has been sourced directly from the treak cliff cavern in castleton the stone has been placed within a classic sterling silver band 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 these stunning pieces of jewellery you can find other