Sterling Silver Blue John Four Stone Dragonfly Brooch. M248. This striking brooch features four cabochons of rare Blue John that have been directly sourced from Castleton, Derbyshire. The stones are set into this intricately crafted dragonfly design. All our Blue John jewellery is designed and crafted within our very own workshops in Ashbourne, Derbyshire where a team of skilled craftsmen transform the natural Blue John stone into these stunning pieces of jewellery. You can find other matching Blue John jewellery and other Blue John brooches on our website. All articles purchased from C W Sellors are lovingly and securely dispatched with our elegant jewellery packaging.