Blue john ring oval stone large silver r013 this striking statement ring part of our heritage handmade jewellery collection boasts anunmissable cabochon ovalshaped piece of rare blue john stone that has been sourced directly from treak cliff cavern in castletonthe stone is framed within an exquisite sterling silver setting and completed with a widesterling silver band all our blue john jewellery is designed and crafted within our very own workshops in ashbourne derbyshire where a team