Here is a description of her jewels worn to a Garden Party at Buckingham Palace on the day before the French State Visit.
This is the only photo I found of HM at the Garden Party. I think she is wearing Queen Victoria's bow brooch on her gown but I cannot identify which brooch she has on her hat. She is wearing the Hanoverian pearls with a third longer string, probably the one I have come to associate her wearing as part of the Indian pearls.