Sterling Silver Blue John Marcasite Double Row Stone Necklace. P2133 This stylish necklace features a highly polished marquise shaped cabochon of fine Blue John stone that has been sourced directly from the Treak Cliff Cavern, Castleton in Derbyshire. The stone has been placed within a vintage style sterling silver setting embellished by two layers of marcasite stones, giving an elegant and sparkly finish to the piece. The pendant hangs gracefully from a fluid 18 inch long sterling 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 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. Dimensions: 31mm x 15mm plus a 5mm bale, Blue John: 16mm x 5mm.