Not the biggest
The largest diamond is named "Cullinan 1", also known as "Star of Africa", weighing 530.02 carats. The second largest is named "Cullinan 2" and weighs 3 17.4 carats. Now the egg-sized "Star of Africa" is embedded at the top of the king's throne, with 2444 diamonds on it. Cullinan II, the size of pigeon eggs, is embedded in the most important crown of the British royal family-the Imperial Crown.