Thank you GDella and lancashirelad for the info. You have just increased my knowledge exponentially!
What a shame about Maud's tiara. I suppose these things happen from time to time, but Garrard must have been absolutely mortified with the bad publicity. Is it thought to have been an 'inside' job?
lancashire lad, I think I know the tiara of Alexandra's to which you refer. It is a lovely piece, and I have often wondered about its current whereabouts. If it had still been in the possession of HM QEII, I thought it might perhaps grace the head of the Duchess of Cornwall in the near future, but alas, it would seem that will not be the case. Perhaps Mette-Marit will dust it off instead! (And it will look better on her anyway, IMHO)
Thanks again to both of you, and if anything more turns up, please post!