Silver blue john large oval rope edge pendant necklace p131 this simple and stylish necklace features a striking oval cabochon of blue john stone that has been sourced directly from the treak cliff cavern in castleton derbyshire the stone is placed within the centre of a solid sterling silver setting detailed with a twisted rope edge the pendant hangs gracefully from a fluid 18 inch longsterling silver chain completed by a classic bolt ring clasp for easy wear all our blue johnjewellery