What would you say if you were told that there is a place where it does indeed rain diamonds? The chances are that you would want to get there immediately to then gather up as many of them as you can, but that is not possible.
You see, the place we are talking about is Saturn, and the exact same phenomenon also happens on Jupiter, so it is slightly out of your reach. The reason why this happens is because of the huge amount of gravitational pressure that exists on the planets, that then drags carbon into the atmosphere. When you place carbon under insane pressure, then it does indeed form diamonds so, on a technical level at least, both of those planets are able to produce rain that is completely different to anything that we could ever hope to experience on our own planet.