About Cullinans I and II worn as a brooch by Queen Alexandra to a State Opening of Parliament, we had a very extensive analysis of this some time back on the Royal Jewels of the World message board.
I posted my conclusions over the correct years for various portraits of Queen Alexandra wearing extremely similar, but not identical outfits in portraits.
This link takes you straight to a set of pics, but the entire thread might interest you.
http://members2.boardhost.com/royal-jewels/msg/1346723663.html
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