Yes! The Gas Giants in our solar system, including Saturn and Jupiter rain diamonds! And other quite toxic liquids and gasses. Some of the moons of these two giant planets have atmospheres too and so rain liquid cooking gas for example. Liquid acid rains constantly on Venus! Wherever you have an atmosphere on a planet or a moon, you have some kind of rain, not necessarily of water!
I personally wouldn’t mind a gentle shower of diamonds… (without all of the suffocating, hostile gases and temperatures, of course)!
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