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I think the only difference is the exposure to pressure and time ... (which is thousand years)

Also, diamond is much more dense and burns more cleanly into CO2 because it is pure carbon, unlike coal, which also has hydrogen in it.

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The first sentence above is wrong on time. Most of the world's coal reserves formed more than 300 million years ago, over some millions of years, in the Carboniferous Period. Not "thousand".

There is another, very big difference. Coal is a sedimentary rock, and hydrogen would not make it burn less cleanly - even if it could exist within coal as hydrogen alone. Most of the impurities in coal are sulphur and organic compounds.

Diamond occurs within certain igneous rocks formed at great depth hence great pressure and temperature.

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