Sterling Silver Blue John Medium Oval Bangle. B020. This simple and sophisticated bangle is part of our Heritage handmade jewellery collection and boasts a stunning oval piece of Blue John stone that has been sourced directly from the Treak Cliff Cavern in Castleton. The stone is framed within exquisite Sterling Silver and the bangle is completed with a wide solid Sterling Silver band, measuring 10mm across at its widest point. 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 bangles on our website. Silver Whitby Jet Medium Oval Bangle, Blue John stone 22 x 12mm.