Sterling Silver Blue John Slim Oblong Ring. R405. This simple and stylish ring boasts a stunning oblong shaped cabochon of the finest Blue John that has been sourced directly from Castleton, Derbyshire. The stone is placed within an exquisite sterling silver setting that sits on a classic silver band. 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 on our website. All articles purchased from C W Sellors are lovingly and securely dispatched with our elegant jewellery packaging.  Dimensions: Setting: 14mm x 6mm.