I just did a bunch of stuff to it, last thing was grayscale then a red tone curve that I pulled negative for the shadows. Oh, and crop to focus on the concentric lines.
Thanks, mino; not really creative since this type treatment’s been done on watch/clocks for quite a while now by others (and occasionally by yours truly). Mathmap’s the bomb. Believe G’MIC can do this, too, but I’m more comfortable using Mathmap than G’MIC for such renders. Did heal the resulting transparencies using G’MIC, this time, though (Solidify).