Sterling silver blue john oval celtic clip bangle b589 this elegant bangle features hand carved blue john that has been sourced directly from the derbyshire blue john cavern in castleton the highly polished blue john cabochon gemstone is framed within a unique sterling silver bangle which fastens securely with a fold over clasp all our blue john jewellery is designed and crafted within our very own workshops in ashbourne derbyshire where a team of skilled craftsmen turn the raw blue john st