Silver Blue John Marcasite Celtic Crossover Flower Necklace. P2129. This stylish pendant boasts an striking cabochon of rare Blue John stone that has been sourced directly from Treak Cliff Cavern in Castleton. The stone has been set within an intricately crafted sterling silver flower design embellished with sparkling marcasite. The pendant sits gracefully on a fluid 18 inch sterling silver chain that is fastened by 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 Celtic Crossover Flower Necklace