On Earth, amethysts can form when gas bubbles in lava cool under the right conditions. In space, a dying star with a mass similar to the Sun is capable of producing a structure on par with the appeal of these beautiful gems.
![](https://scx1.b-cdn.net/csz/news/tmb/2020/acosmicameth.jpg)
Source:
https://phys.org/news/2020-11-cosmic-amethyst-dying-star.html