The tiara was made for Queen Mary (Queen Elizabeth II's grandmother) by Garrard in 1914 and was based upon a tiara worn by her grandmother Princess Augusta of Hesse. The history of the stones included in it is particularly interesting: the pearls originally came from the Girls of Great Britain and Ireland Tiara, which many people will recognise as the crown Queen Elizabeth II wears in many portraits found on stamps and currency across the commonwealth. That tiara originally had pearls on top, but Queen Mary had them changed for diamonds and used the pearls in her new version of the Cambridge Lover's Knot Tiara.