According to Ursula's royal magazin site, this picture is a scan from a magazine which photoshopped the tiara on Princess Birgitta's head. The magazine confirmed this on inquiry. Wherever the tiara in the composite might have come from, it's definitely neither a Bernadotte nor a Hohenzollern piece. Link to the info (which is more detailed in the German version):
--Previous Message-- : I found this picture of Princess Brigitta on : Foro Dinastías. She is wearing her well : known sapphire suite and a tiara which is : completely new to me. It looks like it is : topped with a row of pearls. : : I guess that it’s a Hohenzollern piece, but : unfortunately there isn’t much known about : the Hohenzollern tiaras. Does anybody here : know about this piece? : : : windows 7 screen shot :