Here’s another ring design: The centre of this one is made from a pyrex petri dish.
The glass really adds a lightness that I like and at this scale one can really see the pigment’s texture. Also, the pigment application is simple, so it would work well with keeping up with the process. That said, one side cracked when I tightened the screws (even with a rubber pad in place); so I have some concerns about transporting a bunch of these to Berlin …