In the late 2015, Astronomers discovered clouds in exoplanet HAT-P-7b which may be composed of corundum, mineral forming the rubies and sapphires.
HAT-P-7b was discovered in 2008. The gas giant is located at a distance of about 1,000 light years from Earth. It is 40% larger than Jupiter and orbits a star hotter than the Sun.
It is also known for its extreme temperatures: the side of the exoplanet that always faces the star has temperatures that exceed 2,500 degrees Celsius, while on its night side temperatures reach 1,300 degrees.
After monitoring the light that is reflected in the atmosphere of HAT-P-7b and identifying the changes that occur in it, the team of scientists discovered that the distant exoplanet experiences massive changes in the winds, which can give rise to catastrophic storms. If such storms occurr, then the rains will be nothing but ‘rubies’ and ‘sapphires’.
Apart from this, in our Solar System, deep within Neptune and Uranus, it rains diamonds—or so astronomers and physicists have suspected for nearly 40 years. The outer planets of our Solar System are hard to study, however.