The description on the MC wiki says Charcoal can be used in place of coal for any reason. I think you should be able to Macerate charcoal, then get charcoal dust or even coal dust, and be able to continue from there to make charcoal/coal balls/chunks...eventually leading to industrial diamonds!
Suggestion: Macerate Charcoal
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- Official Post
Charcoal, in fact, used to be able to be macerated into coal dust. Al has removed that since he wanted coal to have value again, and so one could not "grow" diamonds.
Thread closed.