Diamonds are clear and see-through yet they are made of highly pressurized carbon which if you see in its unpressurized state looks like black powder or a handful of ash, What happens to cause it to become see-through like that. For that matter the same question for sand and silica into glass.
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A carbon atom doesnt absorb light by itself . It is better to say that the bonds between the atoms absorb the light. The bonds in diamond are different than the bonds in say coal, and dont interact with visible light.
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