On this Sunday morning I took some time to surf around on several jewellery related Instagram accounts starting with Vincent Meylan. So I was jumping from this to that and when searching around prussian royal jewellery I found somewhere a german noble lady around 1910 in connection with the german empress Auguste Viktoria or CP Cäcilie. She was wearing a jewel I first thought to be the large wedding gift loop tiara of Crown princess Cäcilie. I was using my smartphone and when I enlarged it was piece I´d never seen before. The picture was a little bit blurry. O.K. Hm.

Now in the night I was searching for prussian aquamarine jewellery and found by accident this:
https://www.1stdibs.com/jewelry/necklaces/more-necklaces/historic-edwardian-prussian-royal-jeweler-diamond-platinum-convertible-tiara/id-j_6297061/

I´m quiet certain it is the same jewel I saw in the morning and completely unkown to me. But regrettabIy cannot find the picture anymore. It is said it was made by Friedländer, one of the prussian court jewellers. I don´t know anything about the page. Quiet obscue to me to sell a jewel like this online. If it´s real and not a copy. A substantial and beautiful tiara and a substantial price.
Do anyone know about the selling platform and the jewel?