Silver blue john marcasite ribbon edge ringr817 this femininering boasts a stunning round cabochon of rare blue john stone that has been directly sourced from treak cliff cavern in castleton the stone is placed within an exquisite sterling silver setting with an enchanting overlapping ribbon detailing embellished by dazzling marcasite stones giving the piece a sophisticated sparkle all our blue john jewellery is designed and crafted within our very own workshops in ashbourne derbyshire w