The Strathmore Rose Tiara was given to the late Queen Mother, Elizabeth Bowes-Lyon, by her parents when she married on April 26, 1923. It can be worn in the 1920s flapper-style dropped down on the forehead or traditionally.
Read more about the tiaras that could be gifted or loaned to Kate for her wedding here.
Prince Charles and Prince William are not the only ones that have showered their brides with the blue gemstone. Prince Albert gave Victoria this diamond and sapphire tiara he designed in 1842. The sapphires are set in gold and the diamonds in silver. It is now in possession of a Queen Victoria descendant and is sometimes lent to museums.