Cosmic Diamond?

It sounds like something out of a superhero comic, but "cosmic diamonds" are real...and quite fascinating.

The penultimate phase of the life of a small star is becoming a white dwarf, which start very hot, but cool down quite rapidly (in cosmic terms).

Sometimes this means the entire star can literally crystallize. When this happens they become a black dwarf, a dead crystal that one might argue is the star's corpse. Theoretically, anyway. The universe is not old enough to confirm this observationally.

But researchers are starting to see it happen in white dwarfs. The crystallization starts with lattices of carbon and oxygen atoms. This process slows the cooling of the white dwarf.

And yes, this might one day happen to the sun, but by then we will long be gone one way or another.