Blue john slim oval link marcasite silver bracelet b876rthis enchanting bracelet boasts seven stunning cabochon blue john stones that have been sourced directly from the derbyshire blue john cavern in castleton the blue john has then been set onto the sterling silver chain and surrounded by beautiful marcasite stones for an unmissable finishrall our blue john jewellery is designed and crafted within our very own workshops in ashbourne derbyshire where a team of skilled craftsmen turn the ra