Princess Diana was very suspicious about her husband-to-be's relationship with his ex-girlfriend Camilla Parker Bowles.
Insiders say she frequently asked Prince Charles about the nature of their close bond in their lead up to their Royal Wedding in 1981.
But her heart was shattered just a few days before she said her vows when she walked into his private secretary Michael Colborne's office.
She saw a package sitting on the desk with Camilla's name written on it, and demanded to see what was inside of it.
She found a gold bracelet engraved with the letters G and F, which stood for Gladys and Fred – the nicknames Charles and Camilla used for each other.
Speaking in a new Channel 5 documentary, Charles and Di: The Truth Behind their Wedding, biographer Christopher Wilson said: "I think she was very suspicious of anything Camilla.
"She asked to see what was inside and eventually she was allowed to have her way.
"She was absolutely in tears, in a terrible state about it.
"It was clear that this was Prince Charles' farewell present to Camilla."
It wasn't the first time Diana has seen a gift from Charles to his ex, and weeks previously had found a bunch of flowers with the same initials signed on the note.
Royal expert Ingrid Seward added: "Her suspicions went absolutely off the radar.
"When she confronted Charles he said 'well yes, I brought her a present because she's a very good friend'.
"I think any woman can understand that that is pretty suspicious."
Charles personally delivered the bracelet to Camilla the day before the wedding.
When Diana asked where he had gone, a bodyguard said he had gone out for lunch.
During an interview in 1997, Diana spoke very honestly about the heartbreak she felt at this moment.
She said: "I was still too immature to understand all the messages coming my way. And then someone in his office told me that my husband has had a bracelet made for her.
"I walked into this man's office one day and I said, 'Ooh, what's in that parcel?'
And he said 'Oh, you shouldn't look at that'.
"So I opened it and there was the bracelet. I was devastated, and I said 'Well, he's going to give it to her tonight'.
"So rage, rage, rage. You know, 'Why can't you be honest with me?'
"But no, absolutely cut me dead.
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