While we are limited to that which humans can observe, the celestial body believed to hold the highest amount of diamonds is Neptune. While Neptune is a gas giant, being primarily composed of hydrogen and helium, it is thought to have a rocky core made up of carbon, nitrogen, and oxygen compounds. The planet's extreme pressure and temperature condition are thought to provide a sufficient environment to encourage the creation of diamonds. The process of diamond formation in Neptune's core would theoretically be similar to the process that occurs on Earth, however at a much greater intensity due to the higher pressure and temperature conditions of the planet.
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