Sterling Silver Blue John Oxidised Patterned Heart Necklace. P2602. This pendant features a heart shaped cabochon of Blue John which has been sourced directly from Castleton, Derbyshire. The gemstone is framed by a patterned heart of oxidised sterling silver. Sold complete with an 18 inch sterling silver chain which fastens with a classic bolt ring style 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 stylish 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: 24mm x 14mm, Blue John: 8mm x 6mm.