Sterling silver 18ct yellow gold blue john large cross heart necklace nunq0000781 this unique 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 silvermount that embraces the gemstonein a cross design itsits gracefully on a 31 sterling silver and 18ct yellow gold cylinde