how did diamonds come on earth did they grow

Question: how did diamonds come on earth did they grow
- Keywords:
  diamonds, earth
Asked by nicenadia to Alessandro, Angela, Claudia, Marina, Phil on 11 Mar 2013.
- Claudia Krehl answered on 11 Mar 2013:
  
  Diamonds are created though lots of pressure in carbon materials, which is why they are so hard. We can produce them synthetically now.
  
  http://science.howstuffworks.com/environmental/earth/geology/diamond8.htm

Question: how did diamonds come on earth did they grow