9ct Yellow Gold Blue John Marquise Drop Necklace. P089. This eye-catching necklace features a stunning hand carved and polished Blue John gemstone set in a detailed, vintage style design. Beautifully handcrafted from 9ct yellow gold and sold complete with an 18 inch 9ct yellow gold chain with a classic bolt ring fastening. 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: 35mm x 10mm, Cabochon 13mm x 7mm.