A "diamond" twice the size of the world's largest - the 3,106-carat Cullinan , has been found in the North West Province of South Africa. The light green gemstone, which weighs an astonishing 6,000 carats or 42oz, valued at approximately £15million. Its ultimate value will depend on how clear it is and how many flaws it contains, such as cracks, gas bubbles or carbon marks.
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