Blue John is a semi precious gemstone which was first discovered over two thousand years ago by the Romans. Blue John is a variety of fluorite found only in the beautiful Derbyshire Peak District around the town of Castleton where it is mined and nowhere else in the world, making it unique .
The 11ct Freeform Blue John Cabochon is far and away, one of our most popular items. People can't seem to get enough of it.
Inventory Last Updated: Aug 05, 2021