A hallmarked sterling silver ring with a beautiful diamond shape Blue John stone. Made in our Sheffield studio by designer Andrew Thomson. The stone size is 10mm x 8mm and this unusual design is available with other stones.
Blue John (also known as Derbyshire Spar) is a semi-precious mineral, a form of fluorite with bands of a purple-blue or yellowish colour. In the UK it is found only at Blue John Cavern and Treak Cliff Cavern at Castleton in Derbyshire. During the 19th century, it was mined for its ornamental value, and mining continues on a small scale.
Our stones are 100% natural and therefore may differ slightly in pattern and colour from those in the photos.