German and Austrian Royal and Noble Jewels 2: 2022 -

[MarcBgd]

Beutiful portrait of a German princess in big diamond tiara from 1906:

Hermann Historica

www.hermann-historica.de

Does anybody knows who the Princess might be and what jewels she might be wearing?

It is Princess Elsa of Württemberg, later Princess of Schaumburg-Lippe:

ANNO, Wiener Salonblatt, 1905-02-25, Seite 1

The big pearl necklace is similar, or even the same as her sister Olga was wearing for the coronation of Nicholas II:

1896 coronation ball celebrants | Grand Ladies | gogm

 

[Marengo]

Wow, I thought it would remain a mystery but you have found the answer!
It didn't look like CPss Cecilie, but I only remember photos of Dss Elsa as a younger woman.
IIRC she was engaged to the unfortunate Alfred of Saxe-Coburg-Gotha but that was broken of.

 

[MarcBgd]

Now the mystery remains about the jewelry she is wearing. They look impressive. I guess it's a Württemberg/Russia heirloom.