Amethyst – Natural, Carved, Purple

A portrait of the Roman Emperor Caracalla in an amethyst intaglio, changed in the Byzantine period into a portrait of St. Peter with the addition of an inscription and a cross, ca. 212 CE, from the Cabinet des Médailles in the Bibliothèque nationale de France. Photo by Clio20. Licensed under CC By-SA 3.0.

Article: Amethyst Meaning and Symbolism

Credit: Clio20