Sterling silver blue john one marcasite large cross heart necklace p2262 this elegant necklace is part of our cross heart collection it features a large 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 silver one marcasite stoned mount that embraces the gemstonein a cross design itsits gracefully on a 18 sterling silverchain completed