system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Since it rains diamonds on Saturn and Jupiter, do the diamonds just pile on each other? Do they evaporate?
gpt
The gas giant planets are incredibly hot inside.

They have an enormous, rocky core, the surface of which is closer to a volcano than the earth's crust.

It's covered with an ocean of liquid gas that consantly boiling away then raining down again. Anything that falls to the surface is boiled and returns to the upper atmosphere.

The problem with the diamond rain is that it's theoretical. The presence of it depends on how convective the lower atmosphere and oceans are.

If they're highly convective then the diamonds will mix with oxygen and burn to create Co2. Eventually, all the carbon will be burned this way and there'll be no diamond rain.

If they're more evenly layered, or if a thick layer of hot gas is preventing the liquid ocean from coming into contact with the molten surface, then the diamonds will fall into the lava and boil away without getting the chance to bond with any oxygen.

AFAIK, we don't know which of these is true. We don't even know how thick the atmospheres are or how big or hot the rocky cores are.