Sterling Silver Blue John Marquise Brooch, M086. This stunning brooch features a stunning cabochon of rare Derbyshire Blue John. The stone is elegantly set within sterling silver and fastened by a classic brooch clasp. 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 and in stores. All articles purchased from C W Sellors are lovingly and securely dispatched with our elegant jewellery packaging. Dimensions: 35mm x 19mm, Blue John; 33mm x 17mm.