Blue John a beautiful circular piece as well as a circular piece of black Whitby Jet on the other side.. This is a reversible pendant.The stones have been set in Sterling Silver. (Silver chain sold separately - please enquire)
Blue John (also known as Derbyshire Spar) is a semi-precious mineral, 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.
The jet found at Whitby, in England, is of early Jurassic age, approximately 182 million years old.Whitby Jet is the fossilized wood from species similar to the Monkey Puzzle tree.