Do diamonds come from coal?
In addition to the carbon, intense heat and pressure come together under the surface of the earth's mantle to create natural diamonds. While coal is also made of carbon, it contains lots of other impurities that make it impossible from diamonds to form out of coal. How does coal become a diamond? Over the years it has been said that diamonds formed from the metamorphism of coal. According to Geology.com, we now know this is untrue.