Blue john tapered marcasite silver bracelet b880rthis enchanting bracelet boasts an unmissable round piece of cabochon blue john that has been sourced directly from the derbyshire blue john cavern in castleton the blue john stone has been set onto a delicately crafted sterling silver chain that showcases stunning open detailing that has then been embellished by mesmerising marcasite stone for a sparkly finishrall our blue john jewellery is designed and crafted within our very own workshops in