Sterling Silver Blue John Seven Stone Marquise Necklace. N159. This eye-catching necklace is part of our handmade Heritage jewellery collection and features seven stunning hand carved and polished Blue John gemstones set in a detailed, vintage style design. Beautifully handcrafted from sterling silver, this luxurious necklace would made the perfect addition to any jewellery lover's collection. 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: 16 inches long with a 30mm drop, Blue John 13mm x 7mm.