I agree that it's unlikely that QEII will give up her favourite tiaras, so I don't expect to see the Girls, Vladimir or Kokoshnik tiaras on Catherine any time soon.
The Rundell seems too big for a young, modern women like Catherine (although I would not be amoung those who would complain about a new sighting of this beauty!). I know, Princess Alexandra wore it as a very young woman, but those were diffenrent times. Also I wonder if the Rundell still exists. It is strange that Queen Mary was never seen with it, as she loved her jewels sooo much.
It would also be great to see the Surrey tiara or the Ladies of England tiara (which is not in your wonderful blog) again. Yet I fear that they don't exist anymore.
That photo of the sapphire bandeau is the clearest I have yet seen of this tiara. It is great to see the sunburst pattern of it more clearly. I wonder if the sapphire could be interchanged with a diamond element? That way Catherine would have an all diamond wedding tiara, and later she could also wear the sapphire version.
One can only hope that the Queen comes up with a really good solution. I don't want to see something similar to Sophie's wedding tiara
!