Sterling Silver Blue John Rhombus Shaped Rope Edge Brooch. m015. This clasic brooch presents a generous piece of highly polished Derbyshire Blue John in a detailed rope edge sterling silver setting. Set with a bar pin that is positioned point-to-point, this brooch will make a statement with any outfit.  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 brooches on our website. All articles purchased from C W Sellors are lovingly and securely dispatched with our elegant jewellery packaging. Dimensions: 24mm x 37mm, Blue John; 20mm x 33mm.