Sterling Silver Blue John & Marcasite Marquise Necklace, P2144. This stunning necklace boasts an unmissable cabochon of marquise shaped rare Blue John stone that has been sourced directly from Castleton, Derbyshire. The stone is placed within an exquisite sterling silver diamond setting that showcases dazzling marcasite, giving the piece a sophisticated sparkle. A second silver diamond crowns the pendant as it hangs gracefully from the delicate silver chain complete with a classic bolt ring clasp. 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 necklaces on our website. All articles purchased from C W Sellors are lovingly and securely dispatched with our elegant jewellery packaging.