As Princess of Wales, Princess Kate is the most senior female member of the royal family behind Queen Camilla, and as such, she has been present at a number of high-profile ceremonies and events where some of the world's most priceless jewels have been on display. Since Prince William in 2011, Kate has been entrusted with some of the royal family's most valuable treasures, including necklaces, earrings, bracelets and glittering tiaras.