As always Beth, great research and photos to back it up.

I am sure this has been discussed before and I just don’t remember ……
What necklace is QEQM wearing?
It looks to be a single three-tiered diamond swag, similar to, but not (I do not think), the George VI Festoon Necklace.

Also of note, QEQM is wearing the sash of the French Legion of Honour. HM did not often wear foreign orders – especially later in life.