There was nothing to indicate scale in my "object" photos from yesterday and several people were convinced my mystery object is a door knob. No, it absolutely isn't a door knob! It is flat on the bottom, with a carved starburst pattern and far too large and heavy to be used as a door knob. I believe it is nothing more than a paperweight, and perhaps, as Christine suggested, designed to sit in the sunlight and refract light into rainbows of color. I need to find a place to put it where it might get some direct sunlight. Most of our windows face north and south, which won't work very well, but I'll move it around.