Chalcedony is a relatively common mineral that has been known and widely used for thousands of years. At the Palace of Knossos which is the largest Bronze Age site on the Greek island of Crete, chalcedony seals have been found which date to approximately 1800 BC.
Much of the blue material sold commercially has been dyed or heat treated to enhance the colour. The colour of this blue chalcedony mineral to the best of our knowledge is completely natural. It has a smooth texture, slightly waxy lustre and is highly translucent around almost the entire edge.