That was a fascinating discussion to revisit! Thank you RDavid!

I didn't take part in that discussion because I know so little about the Belgian royal jewels but, as Vincent Meylan said, a lot of what you suggested makes sense. And, of course, as Vincent Meylan did the history of Van Cleef and Arpels, he knows which jewels the Grand Duchess Josephine Charlotte had inherited from her mother which were dismantled to make her tiara/necklace. So that accounts for some of the emeralds.

But the tiara had always remained a mystery until you put forward your theory. As our current information stands, I am persuaded by your theory. I think it makes a great deal of sense.

It is so unfortunate that all your images are no longer available, but there are sufficient other images to help us understand what you were trying to illustrate. This is a fascinating topic.

Many thanks!