Italian, late 16th century.
Set in a high carat gold ring.
Intaglio measures 1.9 x 1.4cm, ring size R UK / 8 1/2 US.
For a similar example carved into a sapphire see; Lot 10, Small Wonders: Early Gems and Jewels, Sotheby’s, New Bond Street, 15 July 2021.