Garnet

During the Middle Ages, some people believed dragons had eyes made of garnets. These translucent garnets are still attached to the graphite schist where they formed. When backlit by a flashlight, they look like "dragon eyes." This specimen came from the Red Embers Mine in Erving, Massachusetts, USA. "Fiery Dragon Eyes (Red Embers Garnet)," photo by Mike Beauregard. Licensed under CC By 2.0.

Article: Garnet Symbolism

Credit: Mike Beauregard