The world's largest diamond was mined in the Transvaal region in South Africa in 1905. It was named after its discoverer, Cullinan. Originally it weighed 3106 carats (621 g.). After it was presented to King Edward VII in 1907 it was cut into the famous 'Star of Africa' diamond as well as into over one hundred separate stones. Some of those stones were used on the British Crown Jewels. Diamonds are the hardest known naturally occurring substance and are extremely resistant to acid or alkali. Diamonds are used for cutting or grinding other hard substances and on the cutting edges of drilling bits used for oil wells. You can only cut a diamond with another diamond.
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