Sterling Silver Blue John Marcasite Shoulder Ring. R753. This vintage style ring features a hand carved cabochon of Blue John which has been sourced directly from Castleton, Derbyshire. The gemstone is set in solid sterling silver which is further embellished with dazzling marcasites, bringing a sophisticated sparkle to the piece.  All our Blue John jewellery is designed and crafted within our very own workshops in Ashbourne, Derbyshire where a team of skilled craftsmen transform natural pieces of Blue John into these stunning pieces of jewellery. You can find other matching Blue John jewellery on our website. All articles purchased from C W Sellors are lovingly and securely dispatched with our elegant jewellery packaging.