18ct yellow gold blue john medium cross heart necklace p1543 this elegant necklace is part of our cross heart collection it features a medium 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 18ct yellow gold mount that embraces the gemstonein a cross design itsits gracefully on a 18 18ct yellow gold chain completed by a classic bolt ring clasp for ea