They're in a container 22mm (7/8in) in diameter. It doesn't look quite as scratched in real life as it does in the picture, because the light from the scanner pikced out every imperfection in the glass. Because of the scratches, you can't see that at the back there's a ring around the edge with notches cut into it so that when you shake the device the dice roll round it rather than slide round it, thus helping with the randomness.
Turning the container so it's glass-down reveals that on the reverse side is a piece of soldering in the middle. This suggests to me that originally there was something stuck to it. My guess is that it's one of a pair of cufflinks and the stalk has come off it.
I don't quite know what I'm going to do with it yet, other than keep it. I'll probably put it on a shelf in my office at the university so that I don't have to make a decision for several years.
Yes, that will work.