18ct white gold blue john 013 carat diamond twisted shoulder ring r1009 this elegant 18ct white gold ring featuresa stunning roundshapedhand carved blue john stone that has been sourced directly from the treak cliff cavern in castleton derbyshiresparkling diamondstotaling 013 carats embellish the shouldersof this feminine piece all our blue john jewellery is designed and crafted within our very own workshops in derbyshire where a team of skilled craftsmen turn the raw blue john into