One is the "unwieldy" Imperial State Crown, which the Queen confides is so heavy that in order not to "break my neck" she is forced to bring her speeches up to her face to read them.
The British Crown Jewels were hidden inside a biscuit tin during World War II.
The queen not only granted permission for the jewels to be seen and captured for the show, but she also watched footage of her own coronation (which took place back in 1953)-which she had never done before.
In the documentary, the Queen also talks about the amusing trials and tribulations of being head of state - from the perils of wearing a heavy crown, to her robes sticking to a thick carpet pile.
Instead of focusing on all the impending responsibilities that a Queen would need as a the Head of her country, Queen Elizabeth was more concerned with how uncomfortable her transport felt. "She's also got a wonderful sense of humor in a way without in any form undermining the story or the symbols or what the coronation is about", he said.
'Because if you did your neck would break, it [the crown] would fall off'.
"So there are some disadvantages to crowns, but otherwise they're quite important things", the Queen adds.
The Queen has shared a rare, personal account of her coronation, giving fans an insight into life as the monarch.
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"Fortunately, my father and I have about the same sort of shaped head, but once you put it on, it stays".
Despite the intense pressure that must have been on her at the time, Bruce said Queen Elizabeth spoke of the coronation with lightness and clarity.
Queen Elizabeth II was only recently told that the priceless gemstones were hidden to prevent the Nazis from stealing them.
She reveals the seven-metre-long (24ft) gilded carriage, which weighs nearly four tons and is pulled by eight horses, is "not meant for travelling in at all".
"Horrible", she said of the ride in the 4-tonne carriage from Buckingham Palace to Westminster Abbey, where English monarchs have been crowned since 1066. "I mean, it just remains itself", she said.
The Imperial State Crown, which she still uses at some formal events, was one of two used during the ceremony; the other being the St. Edward's Crown, which weighs 4 pounds and 12 ounces and is made of solid gold.
The Coronation is set to be broadcast on BBC One on Sunday.