Silver Blue John Marcasite Ribbon Edge Ring. R817. This feminine ring boasts a stunning round cabochon of rare Blue John stone that has been directly sourced from Treak Cliff Cavern in Castleton. The stone is placed within an exquisite sterling silver setting with an enchanting overlapping ribbon detailing embellished by dazzling marcasite stones, giving the piece a sophisticated sparkle. 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 rings on our website. Silver Blue John Marcasite Ribbon Edge Ring