Blue john bracelet single stone oval foxtail silver b758 this mesmerising bracelet comes from our foxtail collection and boasts an unmissable oval shaped piece of cabochon blue john that has been sourced directly from treak cliff cavern in castleton the blue john stone is set on the stunning sterling silver foxtail chain that is completed by a strong magnet clasp for easy wear all our blue john jewellery is designed and crafted within our very own workshops in ashbourne derbyshire where a t