There are two records for that: Centenary Diamond - world's largest colorless, flawless diamond and The Golden Jubilee Diamond - World's largest faceted diamond. These two are among the largest polished (finished) diamonds. The Cullinan diamond is the largest rough gem-quality ever found, at 3,106.75 carats.
The largest known diamond is the Cullinan diamond, which was discovered in South Africa in 1905. It weighed 3,106 carats in its rough form and produced several large diamonds, the largest of which is the Cullinan I, also known as the Great Star of Africa, which is 530.2 carats.
The largest diamond deposit in the world is in Russia, specifically in the Yakutia region. The Mir Diamond Mine and the Udachnaya Pipe are two of the most well-known diamond mines in this region and have produced some of the world's largest and highest quality diamonds.
Idaho's largest diamond was found near the town of McCall, in the central part of the state. Discovered in 1970, this diamond weighed 12.92 carats. The area is known for its geological diversity, which can occasionally yield such precious stones.
Carbon has the largest number of allotropic forms, with several well-known forms such as diamond, graphite, and fullerenes.
The largest carat diamond ever found was the Golden Jubilee Diamond. It was found in 1908 and when it was cut weighed 545 carats. It is known as the Great Star of Africa.
The largest stone in the Imperial State Crown is called the Cullinan II diamond, also known as the Second Star of Africa. Weighing 317.4 carats, it is a cushion-cut diamond that was part of the Cullinan diamond, the largest gem-quality diamond ever discovered. The Cullinan II is set in the band of the crown, alongside other significant gemstones.
There are two scepters used in the British Coronation ritual. From Wikipedia: "The Sceptre with the Cross was made in 1661, and is so called because it is surmounted by a cross. In 1910, it was redesigned to incorporate the Cullinan I, also known as the Great Star of Africa, which at over 530 carats (106 g) is the second largest cut diamond in the world after The Golden Jubilee."
The largest diamond in the world is the Cullinan diamond, which was discovered in South Africa in 1905. The Cullinan diamond weighed 3,106 carats in its rough form and was later cut into several smaller diamonds, with the largest finished diamond known as the Great Star of Africa weighing 530.2 carats.
A stone of this quality is known as a Paragon -- and there is such as stone: named The Paragon.You can read more about it, below. From that page:"The largest flawless diamond in the world is known as The Paragon - a D-class gem weighing 137.82 carats (27.56 g), which is the 10th largest white diamond in the world." Today it is apparently in the possession of Graff Jewelers.
The largest diamond in the universe is a white dwarf star named BPM 37093, also known as "Lucy." It is located 50 light-years away from Earth and is composed mostly of crystallized carbon, essentially a giant diamond.
The largest diamond in the world is the Cullinan diamond, also known as the Star of Africa. It was discovered in South Africa in 1905 and weighed 3,106 carats in its rough state. The Cullinan diamond was later cut into several different stones, with the largest one weighing 530.2 carats.