The Japanese sash has something red in it, so I am hoping once again for the Ruby Oriental circlet of Prince Albert for Queen Camilla. But I would love the Kokoshnik too or the Vladimir. As far as incoming state visits go it doesn't get much more important than the Japanese emperor.
As for the Duchess of Edinburgh: I am hoping for the aquamarine ribbon tiara. As for the second day I am hoping ideally (and very unlikely) for the King Faisal's necklace on a frame. In the case she can not use these two pieces -they were probably loans and not gifts- I am hoping for her own aquamarine tiara on both days.
The tiara she received for her wedding looked slightly less unfortunate the last time she wore it but it still is a monstrosity
. There is no need for a member of the BRF to wear such an ugly bric-a-brac tiara as we have seen on the former Pss of Tarnovo, now Jordan. Perhaps it is best taken apart and used as hair ornaments. Or returned to the Queen who may try it on the circlet, where they were made for.
If the Duchess of Gloucester attends I would like to see the Teck turqoises or the Cartier Indian tiara - as we haven't seen them for some time IIRC. But she has a lovely collection and any of the other choices would be nice to see too. Due to its versatility whatever form she wears of the Palmette is always a nice surprise.
If the Princess Royal attends: the double-row meander Bandeau Tiara, so we may have a better look at it.
As for the Dutch diplomatic dinner:
The Wurttemberg tiara is the only one I do not like on the Queen that much. I would like to see it once more and hope it will look better. If Amalia attends: something small and something she used before. No need to go through the entire collection before she is 25. So that means I am going for the small sapphire tiara.