Sterling Silver Blue John Lineaire Round Stone Adjustable Necklace. N1136. Lineaire Collection - designed by Rebecca Sellors and crafted in their Derbyshire workshop - portrays a timeless, contemporary jewellery range available in sterling silver. With minimalist design and a distinct architectural edge, this elegant adjustable chain necklace features a round Blue John gemstone framed in a contemporary sterling silver setting. The highly polished Blue John stone has been sourced directly from Castleton, Derbyshire. All our Blue John jewellery is designed and crafted within our very own workshops in Ashbourne, Derbyshire where a team of skilled craftsmen transform the natural Blue John stone into these stunning pieces of jewellery. You can find other matching Blue John jewellery on our website. All articles purchased will be lovingly and securely dispatched with our elegant jewellery packaging.