The phenomenon of raining diamonds on planets such as Jupiter and Saturn is caused by extreme atmospheric pressure and temperature, which compress and heat up carbon-containing molecules, causing them to crystalize into diamonds as they fall through the atmosphere.
Scientists have used spectroscopy to detect the presence of carbon in the atmospheres of Jupiter and Saturn, and have also observed lightning on these planets which indicates the presence of carbon in the atmosphere. Additionally, the discovery of diamond rain has been confirmed through laboratory experiments that simulate the extreme conditions found on these planets.
Unfortunately, the diamonds formed on Jupiter and Saturn are not suitable for human use due to their small size and high levels of impurities. The atmospheric conditions also make it difficult for us to access and retrieve the diamonds.
The conditions necessary for diamond rain to occur are not present on Earth, so it is highly unlikely that it would ever rain diamonds on our planet.
In addition to diamond rain, scientists have also observed sulfur and methane rain on other planets, as well as liquid methane and ethane lakes on Saturn's moon Titan. These unique forms of precipitation add to our understanding of the diverse environments found in our solar system.