Luckily, the royal jeweler was nearby and managed to fix the tiara, which was originally crafted for Queen Mary in 1919. A veil also accompanied the tiara for Elizabeth's wedding.

Princess Eugenie Skips Wedding Veil in Favor of Emerald-Embellished Tiara from the Queen All the details behind Princess Eugenie's stunning royal wedding tiara ...

For her special day, Princess Eugenie actually chose the Greville Emerald Kokoshnik tiara, leant to her by the Queen. According to the Tiara Mania blog, the headpiece was created by Boucheron in 1921.