The intaglio dates to the 3rd century AD and the high carat gold ring dates to the 19th century.
Ring size O UK / 7.25 US.
The intaglio measures 1.4 x 1cm.
Similar examples can be found in the collection of the British Museum, Registration numbers: 1917,0501.566 & AF.415.
Two similar examples can be found in the Paoletti Collection, ‘La Collezione Paoletti, Stampi in vetro per impronte de intagli e cammei’, page. 94, figs. 249 & 251.