9ct yellow gold blue john medium oval band ring r012 this striking statement ring part of our heritage handmade jewellery collection featuresahand carved oval blue john stone that has been sourced directly from the treak cliff cavern in castletonthe stoneis framed by highly polished 9ct yellow goldand completed with a solid wide statement band all our blue john jewellery is designed and crafted within our very own workshops in ashbourne derbyshire where a team of skilled craftsmen tu