The author says that this brooch could be the one worn by the Queen Mother on VE Day in 1945. Looking at the pictures I think it could be, but it's difficult to tell. It would make sense about why the Queen has worn it on VE Day in 2015.
--Previous Message-- : Thank you, Alyend. : : Actually, it is the third (and not the : second) time Queen Elizabeth II has worn : publicly this nice aquamarine brooch. The : first time was at Royal Ascot on 19 June : 2014 (first picture), the second time was on : 6 November 2014 for the Recovery Pathway : Reception at Buckingham Palace (second : picture): : : : : :