18ct Yellow Gold Blue John Oblong Twist Ring. R001. This contemporary ring is part of our Heritage jewellery collection and features a hand carved and polished Blue John cabochon. The gemstone is exquisitely set in a contemporary twisted design of solid 18ct yellow gold. 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 on our website. All articles purchased from C W Sellors are lovingly and securely dispatched with our elegant jewellery packaging. Dimensions: Cabochon 9mm x 5mm, Band Width 2mm.