Silver Blue John Small Oblong Stone Ring. R221. This stunning statement ring, part of our Heritage handmade jewellery collection boasts a striking cabochon rectangular shaped piece of rare Blue John stone that has been sourced directly from Treak Cliff Cavern in Castleton. The stone is set within a highly polished sterling silver base and completed with a contemporary looking statement 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 online and instore. Silver Blue John Small Oblong Stone Ring, dimensions 16 x 9mm stone.