Sterling Silver Blue John Small Oblong Ring. R221. Part of our handmade Heritage collection, this contemporary ring features a stunning cabochon of the finest Blue John which has been sourced directly from Castleton, Derbyshire. The gemstone is set within a highly polished sterling silver base and completed with a wide statement 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: Width of band at back: 4mm. Blue John: 12mm x 10mm.