9ct Yellow Gold Blue John Oblong Necklace. P083. This simple, contemporary necklace features a rectangular cabochon of original Blue John, sourced directly from Castleton, Derbyshire. The gemstone is hand carved and set in solid 9ct yellow gold. Sold complete with an 18 inch 9ct yellow gold 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 along on our website. All articles purchased from C W Sellors are lovingly and securely dispatched with our elegant jewellery packaging. Dimensions: 11mm x 22mm including bail, Cabochon 9mm x 13mm