"It seems logical to me that it should go to the crown prince for his wife".
So feel I ! But: I remember the discussion about this particular tiara (and that I saw a potential contender to my favourite the "Girls of Great Britain and Ireland Tiara" ) some time back. IF I recall the crucial question of ownership correctly someone (Bjarne?) stated that the Crown Prince does not own it. So it could be that it belongs to Nikolaos. The reason that his bride did not wear it on her wedding day could be that it did not fit their merry summer-countryside-wedding. The piece she wore was the perfect choice for the surroundings and her gown. But: Why then on Crown Princess Marie-Chantal? It was stated in the same thread that we would see it soon (We did!). So obviously some long planning went into last night's airing! ... And whoever owns it it was the perfect surprise !