Silver blue john cushion ring r406 this elegantring part of our heritage handmade jewellery collection boasts astrikingcabochon cushionshaped piece of rare blue john stone that has been sourced directly from treak cliff cavern in castletonthe stone is framed within a simple sterling silver setting and completed with a classic sterling silver band all our blue john jewellery is designed and crafted within our very own workshops in ashbourne derbyshire where a team of skilled craftsmen