"Precious stones might be relatively rare and hidden deep underground here on Earth, but space is an absolute treasure chest. Astronomers have found a new class of planets, and they're so abundant in the compounds that make sapphires and rubies, they could be positively sparkling."
Of course, the cost to explore and mine these planets would be astronomical. Luckily, we have samples here on earth to get a glimpse of what it might look like.
Read more here: https://www.sciencealert.com/hot-super-earths-are-so-riddled-with-rubies-and-sapphires-they-may-shimmer