Sterling silver blue john marcasite rounded edge oval necklace p2118 this elegant necklace featuresa strikingoval shaped cabochon of rare blue john stone that has been sourced directly from treak cliff cavern in castleton the stone is set within a sterling silveroval pendant embellished by glistening marcasite stones giving the piece a sparkly and sophisticated finish the pendant hangs gracefully from a fluid 18 inchsterling silver chain completed by a classic bolt ring clasp for easy w