As it turns out, the bride-to-be has already tried one on for size, thanks to her reign as Homecoming Queen in high school. She was 27 years old at the time. It weighs almost 3 pounds, and Queen Elizabeth II jokes that you can't look down while wearing it or your neck might break.
But the Palace made it clear that the Queen is not being interviewed in the documentary, which tells the story of the Crown Jewels and the ancient ceremony in which they play a key role. "I think like father, like daughter, this sense of how utterly important the crown jewels are to the country is very much felt by Elizabeth II".
"This is what I do when I wear it!", she said, grabbing the crown and spinning it around to show off her favourite jewel.
But despite looking the picture of happiness to the thousands of people that lined the streets to watch, she has revealed she was actually quite uncomfortable.More news: First in-screen fingerprint sensor announced in a smartphone
Mr Bruce said: "If you look very closely, the table suddenly just goes "woomf" and the crown "woomf" and the crown jeweller is left there with nothing and she says, "well you know, it's my crown". Credit Associated Press The crown could break your neck. Anxious that the weight of the elaborate jewels at the centrepiece of her crown would injure her neck, she quips: "So there are some disadvantages to crowns, but otherwise they're quite important things". I mean it's only sprung on leather.
The Queen ruminates on some of the more extraordinary diamonds, the Cullinan I, which is in the royal sceptre, and the Cullinan II, embedded in the Imperial State Crown.
In the hour-long programme The Coronation, to be aired on Sunday, the Queen speaks candidly about the moment she was crowned and jokingly says she cannot look down while wearing the Imperial State Crown, which weighs 2lbs 13oz (1.28kg), as her "neck would break".
That crown is placed on the table where she's talking to Bruce, who of course never touches it.More news: Key UK contractor Carillion denies rescue plan in doubt
Among the revelations of the BBC program airing Sunday is that the crown jewels were kept safe during World War II by being hidden in a biscuit tin buried at Windsor Castle.
"These are the chips that were left".
The documentary has been released to coincide with the 65 anniversary of the Queen's coronation.
"Not what they're meant to do", the queen quips. "I thought they were there just to hold one's clothes".More news: Kim Kardashian Flaunts Flat Tummy in a Tiny Crop Top and Thong