The York tiara was made for Sarah Ferguson, 60, to wear on her wedding day in 1986. Designed by Garrard, this was a gift to Sarah from the Queen & Prince Philip.
The palace were coy about this at the time, saying on the day to royal reporters that it had been lent by “a family friend”.
Many will remember the magnificent 1986 wedding of Sarah Ferguson & Prince Andrew, in part because of the gigantic flower crown Sarah wore down the aisle.
The new Duchess of York removed the white gardenia headpiece when her and Andrew stepped away from the TV cameras to sign the wedding register, allowing the York tiara underneath to be seen.
This was done to show her moving from being a member of the public to a member of the Royal Family, and was a great piece of showmanship.
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The platinum tiara features swirls of foliate diamond scrolls, which are punctuated by round white diamonds before rising to a peak five carat diamond at the centre.
It came as part of a demi-parure, a jewellery set including a necklace, earrings and bracelet.
The Duke & Duchess of York divorced in 1996, and Sarah kept the tiara as part of her settlement. She has worn it on several occasions over the years.
Some thought Princess Eugenie might choose the York for her 2018 wedding, but instead she wore the Greville Emerald Kokoshnnik. While it is unlikely that Beatrice will choose the York either, it is one possibility.
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How many tiaras are there in the royal collection?
There are dozens of priceless tiaras owned by the Queen and other members of the Royal Family. Many of the British aristocracy also own tiaras, wearing them at state banquets and on wedding days.
As well as tiaras currently in existence, there are a couple which have been dismantled to make other diadems.
This includes The Surrey Fringe and The Nizam of Hyderabad.
Some tiaras have formed part of iconic moments in the history of the Royal Family. The Cartier Halo for instance, was worn by Kate Middleton on her wedding day to Prince William in 2011.
Similarly, the Queen Mary Diamond Bandeau was admired around the world thanks to it being the choice of Meghan Markle for her wedding to Prince Harry in 2018.
And it is the Lover’s Knot that is most often seen today, as it is a favourite of the Duchess of Cambridge.
It was closely associated with Diana, Princess of Wales during her marriage to Prince Charles, so holds special significance for Kate.