9ct Yellow Gold Blue John Stone In Ridged Circle Ring, R872. This elegant ring features a stunning circular shaped cabochon of the finest Blue John stone, sourced directly from the Castleton, Derbyshire. The elegant 9ct yellow gold frame features a ridged design, which is perfect for everyday wear.  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 stylish pieces of jewellery. You can find other matching Blue John jewellery along with matching Blue John pendants on our website. All articles purchased from C W Sellors are lovingly and securely dispatched with our elegant jewellery packaging.