Sterling Silver Blue John and Marcasite Tapered Bracelet. B880. This enchanting bracelet is set with a round Blue John gemstone that has been sourced directly from the Derbyshire Blue John Cavern in Castleton. The Blue John stone has been set onto an expertly crafted sterling silver chain, showcasing stunning open detailing that has then been embellished by Marcasites for a sparkly finish. All our Blue John jewellery is designed and crafted within our very own workshops in Ashbourne, Derbyshire where a team of skilled craftsmen transform the natural 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. All articles purchased from C W Sellors are lovingly and securely dispatched with our elegant jewellery packaging.