Silver Blue John Marcasite Twisted Spiral Edge Pendant Necklace. P2141. This unique necklace boasts a stunning oval cabochon of the finest Blue John stone that has been sourced directly from the Treak Cliff Cavern, Castleton, Derbyshire. The stone is set within the centre of an exquisite sterling silver pendant that is surrounded by a twisted edge design embellished by dazzling marcasite, giving the piece a magical sparkle. The pendant hangs gracefully from a fluid 18 inch silver chain complete with a classic bolt ring clasp for easy wear. 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 necklaces on our website. Silver Blue John Marcasite Twisted Spiral Edge Pendant Necklace