Diamonds form between 75-120 miles below the earth’s surface, first appearing somewhere around 2.5 billion years ago. The carbon that makes diamonds, comes from the melting of pre-existing rocks in the Earth’s upper mantle. “Temperature changes in the upper mantle forces the carbon atoms to go deeper where it melts and finally becomes new rock, when the temperature reduces.” Diamonds are rough and rock-shaped. They are typically polished and cut before being sold to consumers.
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