Thumb ring

The Metropolitan Museum of Art

The image shows a cylindrical object, thumb ring, made by an unknown artist. The object is made of a gray material, likely stone, with darker and lighter gray marbling. The cylindrical object has a circular hole in the top. The object is sitting on a surface with a ruler in front of it. The number "509" is written on the front of the object in black. The background is a plain light-colored surface.