Sterling Silver Blue John Marcasite Drop Bow Twist Necklace. N893. This eye-catching necklace features the finest natural Blue John stone which has been sourced directly from Castleton, Derbyshire. The highly polished gemstone is set within a sterling silver bow design which is embellished with dazzling marcasite stones, creating a glamorous vintage feel. Completed with four sterling silver links with marcasite accents, and a highly polished flat snake chain. A beautiful 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 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. Dimensions: bow pendant: 40mm x 37mm. Blue John: 13mm x 8mm. Chain wearable at 16 and 18 inches.