When was "Black glass ring stone" created?

This artwork was created ca. 1st century BCE–3rd century CE.

What medium is "Black glass ring stone"?

Black glass ring stone is Glass, black.

Yes, Black glass ring stone is in the public domain and available for free download under CC0 license.

Unknown Artist

ca. 1st century BCE–3rd century CE

Medium

Glass, black

Dimensions

Length: 1/2 in. (1.2 cm)

Classification

Gems

Culture & Period

Roman · Late Republican or Imperial

Department

Greek and Roman Art

Museum

Metropolitan Museum of Art, New York, NY

Credit

Bequest of W. Gedney Beatty, 1941

Accession Number

41.160.778