Hello,

This video is very revealing !!

I made some captures:

First : yes, the Princess wore the rectangle diamond brooch to secure the sash at back :



Secondly : Alexandra wore her grand mother's brooch at the beginning of the video !!!! I guess again for sapphires or maybe amethysts but certainly not rubies nor emeralds:




Thirdly: The central diamond and pearl element of her now favorite choker was formerly the clasp of a pearl necklace :




Have a nice day !

J-F