Monarchy is symbolic and the monarch's grandest symbols are kept in the Tower of London.
Some of the Crown Jewels will play a central role at the state opening.
They are so precious that when they leave the tower they must take a secret journey.
Only one man can touch them: David Thomas the crown jeweler.
The position of the crown jeweler is an appointment from the sovereign, and it was first created by Queen Victoria in 1843.
Before the ceremony David brings the imperial state crown to the palace in an unmarked box.
The head that wears the crown must be comfortable with the weight. So she will try it on before the day.
The first crown was made for Queen Victoria's coronation in 1838.
It was remade for George VI's coronation and it was partially remade for the coronation in '53.
When I say partially remade, the head size was made smaller and the arches were lowered to make it more feminine, and a lot lighter.
It still weighes two and a half pounds.
I mean, you've got the most fantastic collection of stones in here, right in the front is the second star of Africa.
The Black Prince's Ruby right in the front– it isn’t a ruby is a spinel. It was actually worn by Henry the 5th in the Battle of Agincourt in 1415.
And the four pearls in the center, three of which were on a necklace belonging to Elizabeth I.
I think we have to be satisfied that we do have the finest finest stones in the English Crown Jewels.