<human>: Can you tell me what is the difference between a man-made diamond and a natural diamond?
<bot>: A man-made diamond is a synthetic diamond that is made in a lab. Natural diamonds are formed deep inside the Earth over billions of years. Synthetic diamonds are made by heating carbon under high pressure and temperature, and then adding impurities to create a diamond. Natural diamonds are much rarer than synthetic diamonds because they are so rare to find.