system
Given the following post, respond as if you're commenting on Reddit:
human
How do we know it rains diamonds on saturn?
gpt
Technically we don't "know"

We know

1) The chemical composition of the atmosphere contains a good chunk of methane based on light reflection analysis.

2) We know the mass/volume/density of saturn based on lots of other math and observations.

We put those together and realize that in certain areas of saturn there is enough pressure/temperature to form diamonds.  These would form for a bit *sorta* like rain/drops and hail do in our atmosphere and then "rain"