The Koh-i-Noor
The famous Koh-I-Noor is at the top of our list of the world's most valuable diamonds. The world's most valuable diamond, weighing in at a whopping 105.6 carats, is oval in shape. The stone, which is shrouded in mystery and folklore, is said to have been mined in India in the 1300s. The stone was purchased by the United Kingdom in 1850, and Prince Albert had it cut from 186ct to 105.6ct in 1852 to improve its brightness and glitter. Mountain of Light and the Diamond of Babur are two names for the colorless oval-cut diamond.