The Queen held several investitures and audiences in February.
Of course we assume there are multiple brooches here as well, despite not being able to see them in every case.
February 10: Audiences at Buckingham PalaceSix Petal Diamond Flower Brooch
No brooch here, but plenty of gold buttons. (This is the dress that goes with the Queen's well-known purple and gold button coat.)
I can't make this one out, though it certainly does look intricate.
This looks in shape like the Cullinan V brooch, though it looks a little too small, scale-wise.