There are three famous crowns of England.
The official Crown of England is the St. Edward’s Crown. This is the Crown with which King Charles III will be crowned. This crown has a long pedigree of usage for coronations of English monarchs. There are no famous jewels set on this crown.
The Imperial Crown of State was made for the coronation of Queen Victoria. It is set with the famous Black Prince’s ruby in front. It was worn in the Crown Helmet of Henry V at the Battle of Agincourt. Henry V is immortalized by William Shakespeare in his play Henry V.
The 3rd crown is the Queen Mother’s Crown which has the famous Koh-i-Noor in the middle of the front cross. It was made for Queen Elizabeth to wear for the coronation of her husband King George VI, the father of Queen Elizabeth II.
Here are 2 books on the Koh-i-Noor.