I thought when Martha Louise married she lost her HRH status, would that be why she doesn't wear a tiara at events anymore? Does only someone styled HRH get to wear a tiara at events in Norway? I'm not sure that's why I'm asking but that would be my guess. Yes, Socal girl I agree with you that Sonja could have let Martha Louise borrow more substantial tiaras when she was still a princess.
And I agree with you guys that Madeliene's aquamarine tiara is not very pretty, it looks like something that a Star Trek princess would wear. And I agree that victoria's first tiara shouldn't even be called a tiara or even since you can't see the stones that are on it. But this is conversation that's already been covered in the Worst Royal Jewels thread so I will stay on topic here.