Reminds me of that one post of that guy saying he didn't understand why Rose was called Rose Quartz, because image searching the gem didn't match up to how it looks in the show. BUT, searching "pink diamond" lead to a perfect match.

Also the wiki page is saying there were "4 divisions in the Great Diamond Authority". Granted I don't know when a "Diamond Authority" was established, still… it's all starting to come together.

I'm pretty sure she says that one of the earliest battles of the war was fought there. So, like, maybe?