Since none of the current crown jewel components are available for sale, or valued otherwise, it's not possible to give a monetary-amount answer to your question.
However, the largest diamond in the Imperial State Crown -- one of many, as below -- is the Cullinan II, or Lesser Star of Africa Diamond.
The Cullinan II -- again, one of many -- weighs 317.4 carats (63.5 g), is rated as D or E colour, Flawless, and and is the fourth largest polished diamond in the world, according to Wikipedia, also below.
(Wikipedia lists an estimate for all of the Cullinan diamonds -- nine in all -- cut from the massive 3,000+ carat raw stone as US$400 million.)
Most have since it includes the Crown and is a National Treasure
The Hope Diamond. It's not the biggest or the best, but it is the most famous. ______________ As well, the Cullinan Diamond is famous; it's in the Queen's Crown Jewel collection.
dawn
A roles Roycebecause the queen has 1 and they are huge and the engine is extremly exspensive A roles Roycebecause the queen has 1 and they are huge and the engine is extremly exspensive
The "Small Diamond Crown" of Queen Victoria was a miniature crown that she wore, and was the one she became most assosiated with. It was made from silver and contained 1187 diamonds.
Money
no the most expensive car is the reventon at £850,000
Antilla is most expansive house of the world.
the international space station
buggatti veyron
most exspensive one
Depends on which store.