This artifact is a cornelian intaglio signet ring in unmarked white metal with an image of Pope Gregory XVI. It is a combination of red and maroon, and in certain light, it tends towards black.
The internal measurement is 18 mm, and the whole structure is very solid and certainly vintage.
are techniques in art in which an image is created by cutting, carving or engraving into a flat surface and may also refer to objects made using these techniques, such as this particular ring.
Cornelian (usually spelled “carnelian”) is a reddish-brown variety of the mineral chalcedony.