The tiara, which was never worn until the 2018 wedding of Princess Eugenie, originated in a bequest from Dame Margaret Greville to Queen Elizabeth the Queen Mother. It was first created in 1919 and features diamonds and emeralds set in platinum, including a 93.7-carat oval-shaped emerald in the centre. Queen Elizabeth II has never worn the tiara, but lent it to her granddaughter Eugenie for her wedding to Jack Brooksbank. Jewellery experts estimate its worth to be somewhere between $5 million and £10 million.