9ct White Gold Blue John Medium Oval Signet Ring, R189. This classic signet style ring features a stunning hand carved Blue John stone, sourced directly from Castleton, Derbyshire. The gemstone is inlaid within a solid band of 9ct white gold. The finished piece is smooth and highly polished.  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 Blue John; 10mm x 12mm, Width of Band; 3mm