Blue john brooch marquise fine silver m086rthis stunning brooch boasts an unmissable cabochon tear drop shaped piece of rare blue john stone that has been sourced directly from the derbyshire blue john cavern in castleton the stone is set within exquisite sterling silver and fastened by a classic brooch clasprall 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 stun