Queen wilhelmina wore the tiara the same evening of the day she got it and even wore it in the gold state-Coach.
Photographic proof of HM wearing the tiara when she is in the Amsterdam Concertgebouw (indeed she rode to it in the Gold State-coach!) can be found In the Book "Koninklijk Fotoalbum" page 12 photo 4.
: Also interesting that Queen Wilhelmina : indeed effectively wore that enormous diadem : outside photoshoots. : :