HI! Thanks for the video and the advice.
I keep the video because it can be very useful, but by looking at it quickly I have already seen some possible problems for my project.
The marketplace wasn’t much help either, but maybe I just used the wrong search terms.
To obtain the desired effect I should apply materials such as subsurface reflective and move the mask based on the position of the camera that is framing the object (a bit like the black “pupil” of praying mantises that always stares at the viewer, regardless of the position).
I tried following tutorials but couldn’t find anything “perfect”.
I should be able to create at least two overlapping layers and a dynamic mask layer at the back that reacts based on the position of the light source and the active camera.
If necessary I can also work with pure code but it would be better with just Blueprint, mathematics, even complex, is not a problem.
It doesn’t have to be game ready material but as faithful as possible to reality.
Allow me to leave a link to the wikipedia page of the Chatoyancy effect and an image of the result I’m aiming for.
https://en.wikipedia.org/wiki/Chatoyancy

Thanks a lot for your time.
Davide Medici.