Ancient worked fragment

The image shows a gray, square-shaped object with a circular hole in the center. The object appears to be made of stone or metal and has a rough texture. The object is labeled "Ancient worked fragment" and the artist is unknown. The object is square with rounded corners and a large circular hole in the middle. The object has a rough, uneven edge. The surface of the object is gray and appears to be weathered. There are some darker spots on the surface, possibly due to aging or wear. The background of the image is a light gray color. There is a small line at the bottom of the image, possibly a scale or measurement marker.