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Scientists Have Discovered Quadrillion Tons Of Diamond, 90-150 Miles, Below The Earth Surface In An Inverted Mountain Structure Called Craton. So, Good Luck Getting It! The Discovery Was Made When The Velocity Of Sound Through The Craton, During A Seismic Activity, Was Identical To The Experimented Velocity Of Sound Through Diamond Rock.

There's over a quadrillion tons of diamonds below Earth's surface, scientists estimate – CNN Style

https://www.cnn.com/style/article/diamonds-under-earth-surface-trnd-style/index.html

As it turns out, diamonds in the Earth are about 1,000 times more common than scientists thought. But they won’t be easy to dig up.