I have read that several times in the swedish tabloid Svensk damtidning, but they often have some errors on facts on jewels. I have never read any confirmation other than it is private and I think it is confirmed that it was a 40th birthday gift to Queen Silvia from her husband. Crownprincess Victoria got a very simple tiara for her 18th birthday so I think Princess Madeleine got the aqumarinebandeau she wore as her first tiara. Why should she get a more substantial and valuable one than her elder sister? But princess Madeleine can have got it as a present later, for example as a weddinggift.