Some of the most expencive

1. Koh-I-Noor : (Unestimated, Priceless) Koh-I-Noor means as “Mountain of Light” from Persian. It’s a 105 carat (21.6 grams) diamond that was once the largest known diamond in the world. The Koh-I-Noor was originated at Golconda in the Andhra Pradesh state of India. It was owned by various Sikh, Mughal and Persian rulers that fought each other from time to time. The stone was found to measure 36.00 × 31.90 × 13.04 mm. The gem remains the property of the British crown and is kept in HM Tower of London and it’s a popular tourist attraction.
2. The Sancy Diamond : (Unestimated, Priceless) The Sancy diamond is 55.23 carat (11.05 grams) of pale yellow diamond that once was famous as the belonging of the Great Moguls. It’s believed that the diamond is Indian origin. This is the first large diamonds to be cut with symmetrical facets. The stone is also unusual because it has no pavilion – just a pair of crowns, one on the other. This historical diamond is now kept in the French Crown Jewel collection housed at the Louvre.
3. The Cullinan : $ 400 Millions The Cullinan Diamond is 3,106,75 carats (621.35 grams) diamond and is the largest rough gem quality diamond ever found in the world. After polished it become Cullinan I or Star Africa first and at 530.2 carats (106.0 grams) is the largest diamond in the world until 1985 with the Golden Jubilee of 545.67 carats (109.13 grams) from the same premier Mine.