9ct yellow gold blue john toscana marquise stud earrings e1124 these stylish earrings are part of our toscana collection and feature marquise shaped cabochons of rare blue john stone which has been sourced directly from treak cliff cavern in castleton derbyshire the beautiful stones are framed within 9ct yellow gold the earrings are completed by classic post and butterfly fastenings all our blue john jewellery is designed and crafted within our very own workshops in ashbourne derbyshire w