Sterling Silver Blue John Marcasite Shield Ring, R819 This feminine Sterling Silver, Blue John and Marcasite ring features a circular central piece of Blue John that has been sourced directly from Castleton, Derbyshire, Castleton. The striking stone is surrounded by sparkling pieces of Marcasite set into a sterling silver shield and embellishing a classic 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 online and in store. All articles purchased from C W Sellors are lovingly and securely dispatched with our elegant jewellery packaging. Dimensions; top of ring 25mm, Blue John; 7mm