Thank you, Kongetro and PaulP, reminding us of this incredible pieces of jewellery.

The Antiquary has made a lot of this kind and his channel is worth a visit indeed. He also has made one about the coronet of Margaret of York, sister of Edward IV. of England and Duchess of Burgundy. Her crown now in the Dom Treasury of Aachen is one of few remaining medieval jewels of royal origins. These coronets as the three Brothers gave us a glimpse of the splendour of medieval and early modern times jewellery which were an important part of the power plays of this time.

Another much earlier medieval crown (11th century) is in the Essen Cathedral Treasury in Germany, which comes from a connection of the canonesses to the imperial ottonic family. Regrettably I could not find any video. The only good fotos are to find at wiki:
https://commons.wikimedia.org/wiki/Category:Essener_Krone#/media/File:KinderkroneOttoIII.jpg

The coronet of Blanche is indeed a tiny little thing. When I saw it in Munich years ago, I wondered how it could be attached to hair or a veil. After seeing the video, I was amazed at the exceptional craftsmanship that I missed during my visit to the Treasury. To many jewellery at a time, obviously…

I`m happy to see a focus on a broader spektrum of jewellery and times here. It can guide us to so many aspects of our history…