happy new year from Berlin and thank you for your response.
I just figured out for myself, that all the fakes on the market are a good way to understand how the beads were made. It is like a reverse engineering process, which leads from time to time in the right direction.
At the same time I think to myself that there must be documents explaining in detail how a "good" fake is made. Wouldn't it be great to have a video documentary of some specialists trying to show how the beads were made?

Cheers, Josh