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The Cullinan Diamond is the largest hard gem-exceptional diamond ever located, at three,106.Seventy five carats (621.35 g or 1.3698 pounds). It was observed by way of Frederick Wells, floor supervisor of the Premier Diamond Mining Company in Cullinan, Gauteng, South Africa, on January 25, 1905. The stone turned into named after Sir Thomas Cullinan, the owner of the diamond mine.
Sir William Crookes finished an analysis of the Cullinan diamond and referred to among others its exquisite readability however also a black spot inside the center. The colors around the black spot have been very vivid and changed as the analyzer changed into turned. According to Crookes this pointed to intense inner pressure. Such strains aren't uncommon for diamonds, and feature sincerely led to causing diamonds to blow up when attaining the surface, or even in the wallet of the miners because of the publicity to the miner's body warm temperature