Space.
It's cold, it's distant, and it lacks oxygen, an important component in the biology of most organics. For instance, humans.
Earth.
Earth is the planet she and her squadron were sent to. It has one satelite, with a Diamond Command Outpost from the previous attempt at conquest and terraformation. They call the satelite their moon.
It's what Doc and her squadron of Rubies are orbiting, though Eyeball's a little ways off.
None of them can speak. None of them can say anything due to the lack of oxygen.
But, they don't require it. Because, after all, they aren't organics.
They're gems.
And they're going to complete their mission, no matter what circumstances the Crystal Gems toss at them.
So, she types a report on her goggles. A report on the Crystal Gems, which gets her distress signal bumped up to Moderate Priority. Then, she types about Rose Quartz, which bumps it up to High Priority.
Finally, she types a single bit about PINK DIAMON-
Her message is bumped up to Priority One. Rescue is imminent.
Or at least, it seems to be.
This is the beginning of many endings, and the ending of many beginnings.