Sterling Silver Blue John Half Filled Heart Necklace. P2540. This contemporary heart pendant is set with a beautiful hand carved and highly polished Blue John gemstone which has been sourced directly from Castleton, Derbyshire. 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 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.