Several hundred years ago, the Pink Diamond was shattered. This had made many gems very angry and has been widely regarded as a bad move. Ridiculous as it sounds, the mourning continues to this day. But then again, those stupid beings never heard of "life expectancy" before: only a mindless tourist would think this happened yesterday. And while this ordeal was all in effort to save planet Earth, it only managed to give the Diamonds the more reason to blow it up. The only thing holding them back is the maintenance of the human zoo, and the Blue Diamond's habitual desires to go down to Earth and mourn over by the Pink Diamond's palanquin.
Now it was time for the Yellow Diamond to decide, once and for all, if Earth really is worth holding on to. In her ship, the Yellow Diamond sat in thought in the center of the bridge, her Pearl standing seated beside her.
"Pearl," said the diamond, "As much as I shudder at the mere thought of doing so, contact Peridot."

Meanwhile, down at the barn, Peridot and Lapis Lazuli were busy binge-watching their favorite show, Camp Pining Hearts. Peridot seen most of them already, but Lapis Lazuli had a lot of catching up to do.
Halfway through episode number 47 out of 179 (and counting), Peridot's tablet started to vibrate, indicating someone wanted to call her. She went to go get it, but left the TV running: she saw that one a dozen times already. UNKNOWN CALLER, read the tablet's display, but Peridot answered anyway. For all she knew, it could've been Steven.

It wasn't. It was the Yellow Diamond. Peridot shrieked, and almost dropped the tablet.
"Peridot 5XG, this is your Diamond speaking, so stop whatever you're doing and pay attention."
Peridot stood stiff and saluted her diamond with her one free hand.
"What am I going to do with you? You called me a 'clod', you terminated my cluster, you even got a Lapis Lazuli living with you. What's next? Are you two siding with those...'Crystal' freaks?"
"Look, my Diamond, the Crystal Gems get on my nerves too, but as far as they're concerned, we're just friends."
Lapis Lazuli overheard what was going on from her end of the room.
"If that's one of the Authority, tell her I have no part in whatever it is you're talking about," she called out.
"Uh...what she said," said Peridot.
The Yellow Diamond smirked, "Well that's cleared up. And to clarify, by 'just friends' do you mean you're a mole? A double agent?"
Peridot took a moment to think about the question, then responded, "Put it this way: I only see them whenever I need something."
"Perhaps you are of some use to me after all. Anyway, the reason I'm contacting you is that I'm sick of sending my gems down there, and have decided that it's high time to get off my throne and do some action myself."
"Action? You don't mean..."
"I'll be coming unarmed. I only want to know the whole story from someone who was there when our beloved Pink Diamond was shattered..." The Yellow Diamond rolled her eyes upon mentioning the deceased, "I just...want to talk."
"And if you get the information you wanted, will you leave the Earth be? I mean, for the sake of the inhabitants and for the resources?"
The Yellow Diamond paused for a dramatic length to think it over. She shrugged.
"Hmm...maybe."

There was nothing more to say. Peridot ended the call, walked back to Lapis Lazuli and the TV, and set her tablet down; wishing to let the magic and wonder of Camp Pining Hearts make her troubles go away for a while.
Then it hit her.
"I GOTTA WARN STEVEN!"