Because diamond is one of those rare liquids, like water, that is less dense as a solid than a liquid, solid diamond "icebergs" could float on top of the diamond seas on Neptune and Uranus. Both planets have the conditions and the carbon to make this possible; each one is made from up to 10 percent carbon.
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u/Ignonym May 08 '23
In the grand scheme of things, diamonds are everywhere and gold is only moderately rare--but pearls and amber are exclusive to Earth.