A fine pair of Blue John earrings with 7mm round stones in hallmarked 925 sterling silver.
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.