Blue John Foxtail 5 Stone Silver Bracelet. B563. This exquisite bracelet comes from our Foxtail collection, designed and created by C W Sellors, and boasts five unmissable round pieces of Blue John stone that have been sourced directly from Treak Cliff Cavern in Castleton. The Blue John stone has been set onto a delicate sterling silver bracelet that is embellished with the striking foxtail detailing. The bangle is completed by a classic lobster clasp for easy wear. All 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 find other matching Blue John jewellery and other Blue John bracelets on our website. Sterling Silver and Blue John.