As diamonds actually began as coal eons ago, will they burn? Yes, diamonds can burn, but the circumstances have to be right. (And insurance companies can easily distinguish a false claim.) However—contrary to popular belief—though diamonds and coal are both forms of carbon, diamonds do not come from coal. Diamonds are virtually pure carbon, but coal is full of substances that prevent it from ever becoming diamonds. Also, for diamonds to form, carbon requires tremendous amounts of pressure and heat, found deep within the earth. Coal is formed from plant debris near the surface. Even the oldest plants are younger than almost every diamond that has been dated.
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