Where Do Diamonds Come From
Since Carbon is a very abundant element on our planet, the materials to make diamonds on earth are easy to come by. Large Carbon deposits, either from fossilized plants or animal life tend to sometimes get trapped in large pockets near the earth's surface. The pockets can be churned in the Earth's crust. Given high-pressures and high-temperatures in the Earth's crust, these deposits can be compressed into diamonds.
As deposits in the Earth's crust build of diamonds, some can get forced up through volcanic explosions or magma flows.
Abundant diamond mining occurs in many countries throughout the world:
Under certain other circumstances, diamonds can be quickly formed on the Earth's surface by asteroids colliding with the planet.
Outside of our solar system, there are even some giant planets bigger than Earth that are made entirely of diamond!