Blue john small heart marcasite silver locket p2147rthis stunning and sophisticated locket boasts an exquisite piece of rare blue john stone that has been sourced directly from treak cliff cavern in castleton the stone is set within an unmissable sterling silver heart shaped locket that is embellished with marcasite beading for a glittering finish the pendant sits on a delicate sterling silver chain that fits comfortably around the neckrall our blue john jewellery is designed and crafted wi