Duchess of Cornwall - Turquoise & Diamond Earrings (part of her set/ parure) Viscountess Linley - three strand pearl necklace with huge golden clasp(s)? And a brooch, perhaps ruby? Lady Chatoo & Zara Tindall - drop/ chandelier earrings? Duchess of Cambridge - Tiffany bracelet, diamond earrings?
Picture Credit: Hello Magazine, BBC, Daily Mail
P.S.: Perhaps we find more close-ups of the Royal Box and a really good one of HM The Queen.