This diamond and platinum bandeau tiara, lent to the Duchess by Her Majesty The Queen, held the veil in place. On public display for the first time, the tiara is formed as a flexible band of eleven sections, pavé set with large and small brilliant diamonds in a geometric design. The centre is set with a detachable brooch of ten brilliant diamonds. The bandeau was made in 1932 for Her Majesty's grandmother, Queen Mary, and specifically designed to accommodate the centre brooch.

This brooch was given to the then Princess Mary in 1893 by the County of Lincoln on her marriage to Prince George, Duke of York (the future King George V). The bandeau and the brooch were bequeathed to Her Majesty by Queen Mary in 1953.