HRH The Duchess of Cambridge - difficult to see under her hair down, but I think, it's one of Buckley London's Poppy Collection crystal paved brooches. HRH wore similar (same) brooch(es) in earlier years
HRH The Princess Royal wore a star brooch which resembles a lot her mother's Jardine Star brooch. Might it be a loan or owns HRH a star brooch of her own? I know, there are some very similar looking star brooches in the BRF.