Sterling silver blue john medium cross heart necklace p1543 this elegant necklace is part of our cross heart collection it features a medium sized hand carved heart shaped blue johnstone that has been sourced directly from the derbyshire blue john cavern in castleton the individual highly polished blue johnhas been framed within a sterling silvermount that embraces the gemstonein a cross design itsits gracefully on a 18 sterling silverchain completed by a classic bolt ring clasp for