9ct yellow gold blue john heart outline stud earrings e1911 these feminine heart stud earrings aremade from 9ct yellow gold and are created using the highest quality hand carved blue john the rounds ofblue john have been sourced directly from the treak cliff cavern in castleton derbyshirethey are secured by a yellow gold post and butterfly fastening all our blue john jewellery is designed and crafted within our very own workshops in ashbourne derbyshire where a team of skilled craft