If you look at the first element along the top of the diadem Princess Grace is wearing, the one to the left (if facing the picture), there are more stones around that element than there are in the Josephine diadem.
There is at least one replica of that diadem, and I rather suspect that Princess Grace might be wearing it.
--Previous Message-- : "On another note (non-jeweled) I noticed : some ladies curtseying. Does a Fürstin have : rank high enough to warrant a curtsey?" : : As this particular Fuerstin was wife of a : Head of State and the curtseying ladies not, : I should think so…? : : The tiara worn for the ‘Century Ball’ in : 1966 with its theme of fashions from a : century before is indeed a piece which : formerly belonged to Empress Joséphine. : It was at one point bought by Van Cleef : & Arpels and loaned to Princess Grace : for that night, along with the other jewels : she wore – therefore, the sparkle (though : not the amount of hair... ) is very real: : : : : : --Previous Message-- : Hm, and here I thought that the diadem Grace : wore in her appearance as 'Sissi' was once : part of the French crown jewel collection. : I will agree that the sparkle does seem a : bit shallow and overly...sparkly. But : perhaps it is just a trick of the lighting, : which seems very bright on her at that : entrance moment. : : On another note (non-jeweled) I noticed some : ladies curtseying. Does a Fürstin have : rank high enough to warrant a curtsey? : : --Previous Message-- : It is hard to say, but when the stories are : true about the cold war between the Château : de Marchais (Charlotte) and the Palais : Princier (Gracia) then your theory of : Princess Gracia wearing her fringe collier : as a diadem sounds more plausible. : : The "Sissi" entrance was really : overpowering but I am not sure the diadem : was real. The glitz and glam coming from : that diadem was a bit different, less : "depth" and less sparkle than real : diamonds would do in my imagination. : : It has never struck me, but now I think : about it: Princess Gracia really had : fantastic diadem-hair. In that department : she easily was on the same level as Queen : Silvia. Also funny to know that the : wonderful Château de Marchais (around 60 km : from the Belgian-French border) and its : domains, still privately owned by the : Prince, is six to seven times bigger than : the whole principality itself. : : : : : :