Diamonds are without a doubt the Milky Way galaxy’s best buddy. Neptune, Uranus, Jupiter, and Saturn have all been studied for their ability to create diamonds. The atmospheres of all four planets are under such severe pressure that carbon atoms can crystalize and transform into diamonds. Scientists could generate the circumstances in a laboratory to show that this occurs on Neptune and Uranus. Separately, another group of experts believes it may rain up to 2.2 million pounds of diamonds on Saturn every year.