Silver blue john cushion foxtail necklet n961 this exquisite necklace is part of our popular foxtail collection and boasts a cushion shaped cabochon of rare blue john stone that has been directly sourced from treak cliff cavern in castleton the stone has been set on an intricately woven sterling silver foxtail chain that hangs gracefully around the neck all our blue john jewellery is designed and crafted within our very own workshops in ashbourne derbyshire where a team of skilled craftsmen