Sterling Silver Blue John Double Sided Round Dinky Fob Necklace, P218. This simple and elegant necklace features a striking cabochon round of rare Blue John stone, sourced directly from Castleton, Derbyshire. The stone is set within polished sterling silver and hangs gracefully from an 18 inch sterling silver chain complete with a classic bolt ring 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 the natural Blue John stone into these stunning pieces of jewellery. You can find other matching Blue John jewellery and Blue John necklaces on our website. All articles purchased from C W Sellors are lovingly and securely dispatched with our elegant jewellery packaging.