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Natural diamonds are produced very deep in the Earth, under great pressure and heat, and some are brought to the surface of the Earth. The carbon source is graphite rather than coal. They also take a long time to grow.

Synthetic diamonds are grown in the 'lab' and thin films of diamond produced this way are used in the semiconductor industry as heat sinks under chips. For diamond has the highest thermal conductivity.

For more information, see wikipedia.org under diamond, or carbon, or gemstones.

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Q: How are diamonds produced from coal to diamond?
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