You are right Carlota, she has worn three tiaras. The vifte tiara after Queen Maud twice as a necklace, for her prewedding dinner and for the dinner for the bishops in 2004. She has ofcourse worn her weddingtiara, the diamond daisy tiara several times and the Ametyst tiara three times, first time for Frederik and Marys preweddingconcert in May 2004.
In the weekend edition of Se og Hør they write that the Ametyst tiara\necklace, (3?) bracelets, brooch ring and eardobs were a gift to Mette-Marit after Ingrid Alexandra was born and that she now owns it. The jewels were purchased by the Queen in the late 90s. She has not worn it much, but was first seen with it around the neck for her 60th birthday. Mette-Marit has only worn it as a tiara and not as a necklace.
1 Mette-Marit wearing the ametysts as a tiara, and the brooch as a pendant on a diamond necklace for the Italian state visit
2 Queen Sonja wearing it as a necklace for Haakon and Mette-Marits prewedding dinner
3 The Queen wearing the necklace as a tiara for the wedding of Alexandra of Berleburg. She wears the two bracelets connected together as a necklace.
4 and 5 Closeup of the tiara\necklace