4. Centenary Diamond $90 million
The Centenary Diamond was discovered in the Premier Mine in South Africa on 17 July 1986. The Precious stone think about at 273.85 carats and was ranked as quality color, maximum quality of colorless diamond. It is the third biggest diamond to have been created in the Leading My own. The Centenary Expensive Diamonds was revealed to the community in last type in May 1991.