Sterling Silver Blue John Toscana Side Marquise Ring, R513. Discover our stylish Toscana collection with this contemporary sterling silver ring. Simple and elegant, it features a striking marquise shaped cabochon of fine Blue John stone, sourced directly from Castleton, Derbyshire. The highly polished gemstone is complimented by a raised frame and a classic band 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 12mm x 4mm