Science Struck
Science Struck: How Does Coal Become a Diamond?
This article looks at the properties of coal, graphite, and diamonds, all of which are made from carbon, and explains why they are different. The formation of diamonds inside the Earth is described, and the theories around whether or not...
PBS
Pbs Learning Media: Diamond Formation
An expert describes the carbon composition of diamonds, as well as the conditions necessary for diamond formation in this video segment from Nature.