Blue john square silver brooch m084rthis exquisite blue john brooch has been crafted from an unmissable piece of blue john stone sourced directly from the derbyshire blue john cavern the piece has been carefully designed and polished and then set in delicate sterling silverrall 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 stone into these stunning pieces of jewellery you can f