Silver Blue John Oval Foxtail Ring. R858. This stunning statement ring is part of our Foxtail collection and boasts a striking oval cabochon of rare Blue John stone that has been sourced directly from Treak Cliff Cavern in Castleton. The stone is placed within an exquisite sterling silver setting that features woven sterling silver foxtail detailing around the stone and down the shoulders and 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 Oval Foxtail Ring. Blue John stone 18x14mm, ring top 24x20mm.