A day after Kate Middleton had to cancel her appearance, the royals were out in full force at the festival of horse racing

Stone called Queen Camilla's decision to wear the brooch a "deeply symbolic choice" as "emeralds represent rebirth, renewal, and enduring love." The Cambridge Cluster Emerald and Diamond Brooch is estimated to be worth as much as $50,000, according to Stone.

King Charles III and Queen Camilla have endured disappointment on the opening day of Royal Ascot as their horse, Reaching High, failed to back up his status as favorite in one of the big races.