9ct yellow gold blue john square split shoulder ring r063 this simple ring features a highly polished cabochon of the finest blue johnstone that has been sourced directly from the treak cliff cavern in castleton the stone is framed by a square of solid 9ct yellow gold and this is set on a classic band with open detailing on the shoulders all our blue johnjewellery is designed and crafted within our very own workshops in derbyshire where a team of skilled craftsmentransform the natural blue