At the pageant, Catherine is wearing her cluster earrings in rubies, sapphires and emeralds. She has worn these earrings previously, and has a co-ordinating brooch as well.
When I saw the first painted portrait of W&C which was unvieled today, I coud not help but notice the Cambridge brooch that she had on in the image. She was also wearing the Carrington pearl and diamond earings and a bracelet that I think was theone previously used by Diana.
I can’t recall a picture of her not wearing it before. I can even recall her wearing it when she was making pastry or something similar with a scout pack.