Silver Blue John Marcasite Marquise Double Row Bead Ring. R814. This simple and stylish ring boasts a marquise shaped cabochon of Blue John stone that has been sourced directly from the Treak Cliff Cavern in Castleton. The stone has been placed within an exquisite sterling silver setting encrusted with dazzling marcasite, bringing a sophisticated sparkle to the piece. The ring is completed by four split shoulders and a classic sterling silver band. 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 And Marcasite Double Row Bead Marquise Ring