Silver Blue John Medium Oblong Bangle. B030. This simple and sophisticated bangle is part of our Heritage handmade jewellery collection and boasts a stunning oblong piece of rare Blue John stone that has been sourced directly from 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 Blue John Medium Oblong Bangle, Blue John stone 23 x 10mm.