Most of the tiaras are still in the family, and quite a few were out during the wedding banquet for the Crown Prince last year. The King´s sisters wore tiaras from their mothers. There is a video in this link (and lots of discussion in the thread):

https://members2.boardhost.com/royal-jewels/msg/1685651669.html

Queen Noor is apparently not on speaking terms with the King, probably due to the conflict between her eldest son and the King. Thus she did not attend (nor did her eldest son and one of their daughters, while one son and one daughter did attend). What has happened to her tiaras are thus not known.