Sterling Silver Blue John Large Curved Triangle Stud Earrings. E209.  These classic earrings feature two stunning, highly polished cabochons of the finest Blue John which has been sourced directly from Castleton, Derbyshire. Completed with secure sterling silver post and butterfly fittings. All our Blue John jewellery is designed and crafted within our very own workshops in Ashbourne, Derbyshire where a team of skilled craftsmen transform natural pieces of Blue John into these stunning pieces of jewellery. You can find other matching Blue John jewellery on our website. All articles purchased from C W Sellors are lovingly and securely dispatched with our elegant jewellery packaging. Dimensions: Blue John: 10mm x 10mm x 10mm.