My mistake, it was Bismuth that said it, in the episode Bismuth.
the quote is
>...[Rose is] just another quartz soldier, made right here in the dirt...
In case you didn't get the joke, Amethyst (real amethyst) forms when Quartz is subjected to higher pressures for longer periods of time, hence all the references to Amethyst being "overcooked", she is very much a type of Quartz.
Home and the place you are born are not the same thing. As Bismuth stated, Rose was born on earth.
Its not really up to interpretation when the rubies are never deployed as front line soldiers, and are only used as bodyguards and escorts. That's about as far from subjective as you can get.
EDIT: Here is a link to the clip, the quote starts at 0:43
It's very hard to see and how she looks in the future should make it a bit more apparent, then. Use this site to host the screenshot. https://imgbb.com/
I assume you know how to screenshot, but if you don't, on Windows press the Windows key located right next to the CTRL and the Print Screen key located right next to F12 at the same time, go to Pictures, the folder named "Screenshots", and upload it to the link above and share the link. If on Mac, hold down Shift+Command+4 and then drag the area you want to screenshot with your cursor and let it go when you want it to screenshot. Should locate on your desktop, use site above. Unless you already have it available, of course. Just had to include this.
Two major unofficial sources of SU on Latin America are saying its about the first Steven Bomb on Latin America
I hear it's moving into Vietnam as Korean wages get higher. There's also the North Korean animation industry, which has some pretty interesting results.