Sterling silver blue john marquise ring r404 this contemporary ring is part of our heritage handmade jewellery collection and features a stunning marquise shaped piece ofblue john stone that hasbeen sourced directly from treak cliff cavern in castletonthe stone is framed simply within a 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