The Queen has a secret message inscribed on the inside of her wedding ring.
Queen Elizabeth II married Philip, the Duke of Edinburgh, on November 20, 1947, at Westminster Abbey, in front of 2,000 guests and 200 million people around the world who tuned into the BBC broadcast.
As is traditional in the royal family, her ring is made from Welsh gold, in a simple style to those worn by Meghan Markle, Kate Middleton, and Princess Diana.
But what sets Her Majesty's ring apart, is that she has a secret message inscribed on the inside of hers which has remained a mystery since that day, with only three people who know what it says: the Queen, Prince Philip, and the jeweller who engraved it.
The Queen reportedly never takes her wedding ring off - so the chances of anyone else glimpsing the hidden message are pretty low.
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Writing in her new book Prince Philip: A Portrait of the Duke of Edinburgh, royal expert Ingrid Seward writes: "At least Philip didn't have the expense of a wedding ring, as the people of Wales supplied a nugget of Welsh gold from which the ring as made.
"She never takes it off and inside the ring is an inscription.
"No one knows what it says, other than the engraver, the Queen and her husband."
Although Philip was spared the expense of his wife's wedding band, he did put a lot of effort into creating the perfect engagement ring - and it has a lot of history.
The ring is made from a tiara that belonged to Philip's mum, Princess Alice.
It was given to her as a wedding gift by Tsar Nicholas II and Tsarina Alexandra of Russia, along with a stunning set of jewels.
Before asking the Queen to marry him, Philip had the tiara taken apart so that he could use the diamonds to make a ring - which he then designed himself
The ring, which features a three-carat solitaire with five smaller diamonds on either side, was given to the then Princess Elizabeth at Buckingham Palace in the July.
But while she was said to love her ring, it was too big and had to be resized.
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