Sterling Silver Blue John Dinky Cushion Necklace. P452. This classic, simple necklace is part of our handmade Heritage jewellery collection and features a hand shaped cabochon of fine Blue John, sourced directly from Castleton, Derbyshire. The gemstone is polished to perfection and set in solid sterling silver. This versatile necklace is sold complete with an 18 inch sterling silver chain which fastens with a classic bolt ring style clasp for easy wear. 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: Blue John 7mm x 7mm.