Not only on the Moon but other places in the solar system have precious metals and gems worth finding. The asteroid 16 Psyche, for instance, is the most metal-dense body in our solar system. Orbiting between Mars and Jupiter, this 140-mile-wide metallic asteroid is believed to be the exposed core of an ancient, destroyed planetesimal. Scientists estimate its precious metals could be worth over a $quintillion.
They already is a mission to Psyche. It will arrive in 2029.