Dr Graham Pearson of the University of Alberta has got his hands on a real rough diamond. It comes from about 500kms underground and is only worth about $20, but provides priceless evidence of a gigantic wet zone way under the earth's surface.
Dr Graham Pearson of the University of Alberta has got his hands on a real rough diamond. It comes from about 500kms underground and is only worth about $20, but provides priceless evidence of a gigantic wet zone way under the earth's surface.