Silver blue john one marcasite medium cross heart necklace p2264 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 silver one marcasite stoned mount that embraces the gemstonein a cross design itsits gracefully on a 18 sterling silver chain completed by a c