Explore the timeless allure of the world’s most expensive diamonds. Learn about their value, rarity, and why they’re ultimate ...

The largest was the 3,106-carat Cullinan Diamond, discovered in South Africa in 1905. Graff described the stone as "the world's most valuable rough diamond".

Botswana Diamonds (LON: BOD) said on Friday that South Africa’s Department of Mineral ... including a 24.6-carat diamond, described as large but of low quality and value, as well as other ...