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Everybody knows what diamonds are… they are precious stones, status symbols, and even a girl’s best friend. They are rare and expensive because is takes millions of years for them to naturally occur. Indeed, most natural diamonds are formed at high temperatures and pressure, at depths of 140 to 190 km inside the earth’s mantle.
Carbon-containing minerals provide the carbon source and the growth occurs over periods from 1 billion to 3.3 billion years (around 25% of the earth’s age). Diamonds are brought close to the earth’s surface through deep volcanic eruptions of magma.
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