Blue john necklace round swirl marcasite silver p2117rthis simple and stylish necklace boasts an unmissable cabochon round piece of rare blue john stone that has been directly sourced from treak cliff cavern in castleton the stone is set within exquisite sterling silver and is embellished by an elegant swirl design detailed by dazzling marcasite stones bringing a sophisticated sparkle to the piece the pendants hangs gracefully from a delicate sterling silver chain complete with a classic bo