In 1954, Queen Elizabeth had only been on the throne for one year. More than three decades later, however, the royal is now the longest-reigning British monarch. Pictured on the left, the royal was photographed wearing the George IV State diadem. It's no secret Queen Elizabeth has an impressive tiara collection. For her coronation, the royal wore the diadem, which was made for the King in 1821 for his coronation. Did we mention the crown holds a whopping 1,3333 diamonds?