Sterling Silver Blue John Oblong Marcasite Bracelet. B878. This simple but stunning bracelet features a small oblong cabochon of Blue John stone sourced directly from Castleton, Derbyshire. The Blue John stone is set on a graceful sterling silver square linked chain that is embellished with exquisite marcasite stone 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.