How to create bezel cutters?

Hi there! I’m new to 3D printing and I’m very much enjoying using Cookiecad to make cutters for polymer clay. I’m wondering how to create a bezel cutter with a pushed in centre that allows the same shape to be inset into it. Like a circle cutter but with an inner circle that pushes the clay down and out to the edges to form a ridge and then a separate cutter could be used to cut a matching circle to inset into the pushed down piece.

make a stamp, the stamp would press middle in

Thanks for your reply! I actually figured it out the other day so now I can apply the process to other shapes.