Silver blue john marcasite flower petal necklace p2119 this unique necklace boasts a stunning round cabochon of the finest blue john stone that has been sourced directly from the treak cliff cavern castleton derbyshire the stone is set within the centre of an exquisite sterling silver pendant that is surrounded by petal motifsembellished by dazzling marcasite giving the piece a magical sparkle the pendant hangs gracefully from a fluid 18 inchsilver chain complete with a classic bolt rin