REVEALED: Crown Jewels formed 400 miles below the Earth's surface.

ISLAMABAD -- giant diamond cut into gems that now adorn the Crown Jewels was formed 400 miles below Earth's surface - three times deeper than other precious stones. Analysis of similar diamonds by the Gemological Institute of America revealed that the Cullinan was a 'super-deep' diamond - and one of the rarest objects on Earth. The largest gem-quality rough diamond ever found, weighing 3,106.75 carats, the Cullinan was unearthed from a mine in South Africa in...

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