Sterling Silver Blue John Toscana Side Marquise Ring. R513. This contemporary ring is part of our stylish Toscana collection and features a marquise shaped cabochon of rare Blue John stone that has been sourced locally from the Treak Cliff Cavern in Castleton. The stone is framed within a highly polished sterling silver setting with a classic 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 into these stunning pieces of jewellery. You can find other matching Blue John jewellery and other Blue John rings online and instore. Dimensions:12x4mm