The human body contains enough carbon to make 9,000 pencils. The human body contains 18% carbon, so, a 70 kg adult contains 13 kg carbon. If we assume a pencil has about 1,5 gr of graphite in it, that’s close to 9000 pencils. Or if you prefer something more upscale, the human body can produce between 50 and 100 diamonds. In fact, there is a US company that extracts carbon from cremated bodies and turns it into diamonds. Chicago-based company LifeGem was the first US company to develop a way to extract carbon from human remains and turn it into diamonds at a cushy profit.