<human>:  Was Dioskourides a lapidary?
<bot>: Yes, Dioskourides was a lapidary. A lapidary is a person or machine who cuts gemstones; classically, it refers to a person who engraves gemstones. Dioskourides put his signature on a Roman amethyst ringstone with a portrait of Demosthenes circa late 1st century BC. Artists sign their work.