Sterling Silver Blue John Three Stone Graduated Double Chain Necklace. N927. Make a statement with this one of a kind necklace featuring three highly polished Blue John rondelles, sourced directly from Treak Cliff Cavern in Castleton. The stones are interspersed with hand hammered sterling silver discs and presented on a double silver chain that is fastened by a classic lobster clasp for easy wear. 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 necklaces on our website. Dimensions: Necklace length 63cm long, Largest Blue John stone 25x15mm, Smaller Blue John stones 22x12mm.