Thank you so much for your very interesting article.
It is the first time I have read in an article that Queen Elizabeth was given the rarely seen Boucheron Greville emerald and diamond tiara with a large cabochon emerald (which is my opinion).
As other jewels described in the article were given to queen Elizabeth I am now convinced that the emerald tiara was also given. It must be currently in the vault.
I don't understand why Queen Elizabeth has never worn the emerald tiara with the other part of the parure in public.
I hope one day we will see this tiara with the emerald necklace by the Doc.