To keep Meghan Markle's 16-foot veil in place, Queen Elizabeth II loaned her the Queen Mary diamond bandeau tiara.
The tiara was made in 1932 with a center brooch that dates to 1893. It was originally owned by Queen Mary, hence the name. The center brooch was given to then-Princess Mary by the County of Lincoln for her wedding to the Prince George, Duke of York. The bandeau was later added by The Queen to accommodate the brooch. The tiara was bequeathed to Queen Elizabeth II in 1953.
According to royal tradition, only married women are allowed to wear tiaras and they are only allowed to be worn during special state occasions.