Blue John Ring Round Split Shoulder Silver. R029. This stunning ring, part of our Heritage handmade jewellery collection, features a striking round cabochon 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 simple 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. Blue John Ring Round Split Shoulder Silver, dimensions 5mm stone.