Sterling Silver Blue John Marcasite Cushion Ring, R745. This simple and stylish ring features a delicate square shaped cabochon of rare Blue John stone, that has been sourced directly from the Derbyshire Blue John Cavern in Castleton. The stone is placed within an elegant sterling silver square setting embellished by dazzling marcasite stones for an unmissable sparkle. The ring is complete by a classic sterling silver band. 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 rings on our website. All articles purchased from C W Sellors are lovingly and securely dispatched with our elegant jewellery packaging.  Dimensions 9mm x 9mm Blue John; 5mm x 5mm