This is a little rough. I had a tough time getting the edges crisp.
Just changing the way I held the old CD case gave me a different shape.
I made this with an old CD case.
You’d have to be careful making the beading hole in this bead. It would be so easy to break off the tip.
I betting this could also be made into an egg shape.
Here is a disc shape. You could put the beading hole in the flat side, as shown here, or in the rounded side.