Sterling Silver Blue John Marcasite Flower Pendant Necklace. P2128. This feminine pendant features a petite round cabochon of fine Blue John stone that has been sourced directly from Castleton, Derbyshire. The stone is set within an exquisite sterling silver flower design embellished with glistening marcasite stones, giving a sparkling finish to the piece. The pendant hangs gracefully from a fluid 18 inch long silver chain completed 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 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. Silver Blue John Marcasite Flower Pendant Necklace. Pendant 25x15mm including bail.