The atmospheres in Neptune, Uranus, and Saturn have such extreme pressure that they can crystallize carbon atoms and flip them into diamonds, American Scientist reviews. How do we recognize this technological know-how reality? Researchers had been able to create the ideal conditions in a lab to show this occurs on Neptune and Uranus. Separately, different researchers speculate that it can rain as an awful lot as 2.2 million kilos of diamonds on components of Saturn every 12 months