Now it's true that Diamonds, by nature, are flawless. But that doesn't make them evil. On the contrary. The Yellow Diamond is, at best, bad-tempered, bureaucratic, officious and callus. It's really difficult to get the Yellow Diamond to smile genuinely; the closest one would ever get is a smirk.

In the temple, Steven was hangin' around on his bed when he got the fatal video call on his laptop from Peridot.
"STEVEN! There you are! Are you sitting down?" she spoke too close to her microphone.
"Yeah. I got nothin' to do right now. Sup?"
Peridot gulped and yanked her collar.
"Yellow Diamond is coming here! What are we going to do?!"
Steven paused, letting the news sink in.
"Could you hold please?"
Peridot nodded and Steven closed the laptop. Then he screamed. Garnet and Pearl (Who knows where Amethyst was?) ran inside to comfort him, then he opened his laptop backup. Peridot was still on the line, and, assuming she was only put on hold so Steven could get the others, she continued.
"Yellow Diamond knows about what we did to the cluster. She said she's coming unarmed, just her and her Pearl. But I sometimes don't believe her."
Steven looked up to Garnet.
"What do you think?"
Steven, Pearl and Peridot paused to let Garnet's future vision sink in. Then she spoke.
"She just wants to talk. Knowing her, I'd say that's pretty lucky for us."
"Pretty lucky?" Now Pearl was distraught, "Steven, you have no idea what Yellow Diamond is like!"
"I say we trust her," Garnet continued in her soothing, almost monotonous voice, "If Peridot says she is coming unarmed, than we should too."
"What about the whole Rose thing?" asked Steven, "Is that pretty much what she's coming to ask about? What if it's like Jasper and she thinks I'm Rose?"
Garnet gave Steven a reassuring pat on the back, "Remember, Steven, I used to serve Blue Diamond, and I assure you, Diamonds aren't that naïve. My future vision tells me Yellow Diamond will understand, and if that succeeds..."
Garnet stood up, and left Steven and Pearl without finishing her thought. It seemed that her future vision needed a rest. Pearl continued to freak out mentally, while Steven turned his attention back to Peridot, still on his laptop screen.
"If it succeeds...would Yellow Diamond leave us and the Earth alone?" he asked.
Peridot sighed, "...Maybe." Then she disconnected.

For the rest of the day, Steven lay dormant in his natural habitat. In his mind, he rehearsed what he was going to day to the Yellow Diamond. Perhaps he could tell her he's not the Rose Quartz anymore, just a Rose Quartz that just so happened to be part human. Surely, he thought, nothing could go wrong if the Yellow Diamond knew the Rose Quartz she is looking for is no more. But what if she doesn't? Should he tell her that Rose Quartz 'gave up her physical form' to have him? Do Diamonds know how human reproduction works?
But even if the Yellow Diamond understood, would that actually change anything? Peridot's 'maybe' didn't sound very reassuring. From what Steven heard on the day Peridot called her a 'clod', it sounded like she took a really long time planning for the destruction of Earth. For all he knew, those plans could've been on display at Alpha Centuri for at least fifty years, maybe longer! Steven feared how the Yellow Diamond would react, her carefully assembled plans going to waste.

The Yellow Diamond's hand ship came into view the following morning. The view of Beach City from the ship looked better than from the telescope back at the Homeworld. The Diamond and her Pearl surveyed the area for a parking spot.
"We'll land there," said one of them, pointing to the giant hill behind the temple.
And they did. The fingers of the ship were aimed toward the top of the hill, surrounding the lighthouse, but leaving a portion open to allow the continued entrance of humans (cough Ronaldo cough) and the exit of light. Locking the entryway to their ship (beep beep) the Yellow Diamond and her Pearl walked down the hill and into town. It was quiet. Too quiet. Almost as if the town has anticipated their arrival and evacuated.
"I don't like this town," the Yellow Diamond declared, "It looks so...deserted."
A voice suddenly appeared and spoke to them. "It's Sunday."
The Yellows looked down and to their left. It was Steven!
"Nobody works on the weekends; they're for relaxation," he continued, "I was told you are here looking for answers."
The Yellow Diamond pointed at the little human.
"...Rose?"
"No, I'm Steven. It's...a long story."
"We have all day," said the Yellow Pearl.
"Come with me."

He invited them back to the temple. The Yellow Diamond shrunk down to the size of Garnet so she could get in. Pearl poured them a hot cup of tea, then backed away quickly with Amethyst and Garnet. Steven arranged the seating of the dining room table so that Steven and the portrait of Rose Quartz hanging over the door were both in the Yellow Diamond's eyesight. He told them everything that was worth telling: the corrupted gems he had to deal with on a regular basis, the whole Malachite fiasco, and the learning of the terrible thing Rose Quartz did to turn the Homeworld against her and the Earth.
"I had no idea why you felt this way about my mom until my last encounter with Jasper and that Ruby last week," said Steven.
"Speaking of which, where is Jasper?" said the Yellow Diamond.
Steven sighed, "She tried to fuse with a corrupted gem. She ended up corrupting herself. I poofed and bubbled her for safety. Her gem is in the burning room if you want to see her."
He felt relieved. Unlike Jasper, the Yellow Diamond listened to him, and she believed him. Her Pearl pulled out a scanner from her person, and waved it over Steven's gem.
"It checks out," she said, "It's Rose's gem, all right, but that's it. She really did give up her physical form."
Steven smiled, then sighed. He finished his tea.
"So what's gonna happen now?"
The Yellow Diamond stood up and walked out onto the beach, returning to her normal size as she did so. Steven followed.
"This planet is too simple and primitive. I don't see what Rose saw in it."
"Well, like I said, it's only Sunday," Steven explained, "You should see what things are like on other days!"
"I believed everything you said so far...'Steven'. But that doesn't mean I won't stop."

Steven looked down at his gem and thought to himself. How could he convince the Yellow Diamond to call off the Homeworld's attack on Earth now? He felt like he was on the track, though, as he noticed that not once since their first meeting did she call him 'Rose'. On the other hand, she has only been here for a few hours. To call the Earth 'simple and primitive' was overgeneralizing, to say the least. Then Steven got an idea. He looked up at the Yellow Diamond once more.

"Would you be willing to give this planet a trial run?" he asked.
"What do you mean, 'Steven'?" said the Diamond.
"If you can survive here on Earth for at least a week, you know-five, seven days, you agree to leave the Earth alone."
The Yellow Diamond took a moment to think it over.
"Okay. But at the same time, you need to figure out what Rose Quartz did to shatter Pink Diamond. Only so much word travels 'round our Homeworld, and most of it is screwed up by gossip."
"It's a deal."
Steven reached out his hand. The Yellow Diamond squatted down, and reached out two fingers and a thumb from her own hand to shake his.

Garnet, Amethyst and Pearl looked on from the front door. Peridot appeared behind them, having warped there from the barn.
"What did I miss?!" said Peridot.
Garnet gestured toward the sight of Steven shaking hands with the Yellow Diamond.
Peridot was obviously befuzzled. "Wha? How did this happen?"
"Eh," said Amethyst, "Steven's just this guy, y'know?"