Sterling Silver Blue John Rope Frill Ring. R010. This elegant ring is part of our Heritage handmade jewellery collection and boasts a stunning oval shaped cabochon of Blue John stone that has been sourced directly from Castleton, Derbyshire. The stone is framed within an exquisite Sterling Silver setting with delicate rope edge detail and completed with a classic Sterling Silver band. All our Blue John jewellery is designed and crafted within our very own workshops in Ashbourne, Derbyshire where a team of skilled craftsmen transform the natural Blue John stone into these stunning pieces of jewellery. You can find other matching Blue John jewellery and other Blue John rings on our website. Dimensions; Blue John Stone 8 x 6mm.