I will try and hunt them down to find them for you. Although I have in no count that it is 'Queen Adelaide's Brooch', in the images you kindly posted, one can clearly make out the central diamond cluster, and one can just about make out the surrounded six diamonds. (Although admittedly the shadow on the brooch does make it hard to immediately work out).
In the meantime, whilst I try find those images, here is a panel pointing out QAd's Brooch being worn with the cockade; posted earlier this week.
--Previous Message-- : : Thanks Boffer, but - I'd like to see that : clearer pic! : : : --Previous Message-- : That is 'Queen Adelaide's Brooch' : (previously : referred to as The William IV brooch. : : I have seen clearer pictures from this same : sitting that clearly show it was this : brooch; yet I cannot find them to post now. : : : --Previous Message-- : : : I can see the two side pieces of the : cockade, and Cullinan III as drop, all above : a bow brooch. : But what is in the centre? : : : : : : :