While sometimes it may seem that anything is possible, there is no evidence (that I know of) of diamonds landing on Earth, which were formed outside of Earth. While diamonds are a valuable and relatively rare mineral, they consists merely of carbon that has undergone unimagineable pressure inside the Earth. Graphite is another form of carbon, though it has not undergone as much pressure as that of a diamond. There is a lot of carbon that exists in Earth’s atmosphere.
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