Sterling silver blue john oval split shoulder ring r025 this elegantring is part of our heritage handmade jewellery collection and boasts a striking oval cabochonof thefinest blue johnstone that has been sourced locally from the treak cliff cavern in castleton the stone is simply but classically framed insterling silver with open detailing on the shoulders all our blue john jewellery is designed and crafted within our very own workshops in derbyshire where a team of skilled craftsmen tu