Silver blue john marcasite large heart locket necklacep2149 this romantic vintage style pendantboasts a highly polishedheart shaped piece of the finest blue john stone that has been sourced directly from the treak cliff cavern castleton in derbyshire the stone is set within the centre of a sterling silver heart locket that has been embellished with a dazzling marcasite stones giving the piece a sophisticated sparkle the locket hangs from an 18 inch longsterling silver chain complete w