Blue john tudor rose reverse silver cufflinks cl463 these stylish cufflinks boast stunning round pieces of cabochon blue john that have been directly sourced from treak cliff cavern in castleton the stone is set within exquisite sterling silver that has been intricately crafted with a tudor rose design on the reverse of the piece all our blue john jewellery is designed and crafted within our very own workshops in ashbourne derbyshire where a team of skilled craftsmen turn the raw blue john