What medium is "Jasper intaglio: Sol in a quadriga (four-horse chariot)"?

Jasper intaglio: Sol in a quadriga (four-horse chariot) is Jasper, red and green.

Is "Jasper intaglio: Sol in a quadriga (four-horse chariot)" in the public domain?

Yes, Jasper intaglio: Sol in a quadriga (four-horse chariot) is in the public domain and available for free download under CC0 license.

This artwork was created ca. 2nd–3rd century CE.

Unknown Artist

ca. 2nd–3rd century CE

Medium

Jasper, red and green

Dimensions

Overall: 3.2 cm (1 1/4 in.)

Classification

Gems

Culture & Period

Roman · Imperial

Department

Greek and Roman Art

Museum

Metropolitan Museum of Art, New York, NY

Credit

Gift of John Taylor Johnston, 1881

Accession Number

81.6.297