FUCK. I hate how all of them chose to sacrifice Phos, cried a shit ton reading this. Though I understand why the gems did what the did, it still doesn't mean that it was right. Phos loved them, so much that they were willing to give them salvation even after all they did to Phos. I find it stupidly ironic that everyone calls Phos useless at the start, yet at the end, they all use Phos for their own gain.
Houseki no Kuni