system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 : How and why dies it rain diamonds on Neptune?

Where do the diamonds come from? What happens when they hit the ground? Do they get sucked back up in a perpetual cycle of raining and sucking?
gpt
> What happens when they hit the ground?

Just to answer this bit specifically, there’s no “ground” on Neptune. It’s a gas giant, so it’s mostly gas and then deeper towards the core the high pressure turns that gas into liquid.