The Yellow Diamond felt Steven's pain in losing Lars to Aquamarine instantly after his (literal) resurrection. It wasn't as gratuitously life-altering as her losing the Pink Diamond, but it was up there.
She tried to comfort him, "Be happy you only had to deal with that Aquamarine. She's the stupidest one I know. If she wasn't one of Blue Diamond's gems, I'd shatter her myself," but it didn't help as much as she liked.
Before he went to bed for the night, Steven decided it was high time he know about what happened to Pink Diamond. On his way up the stairs to the temple, he passed by Greg's van. Greg was inside, himself getting ready to turn in for the night.
"Hey, little guy!" said Greg, "Yellow Diamond told me what happened earlier. I'm sorry you lost your friend, but I wanna thank you for saving my life."
"Yeah," Steven chuckled, "Apparently, some gems haven't been around humans enough to know what a dad is. Before I go to bed, can I ask you about Mom?"
"Sure!"
"When you were together, did she ever say anything about Pink Diamond?"
Greg sighed, and Steven knew right away that he never heard of the Pink Diamond before either.
"Rose and I talked about tons of important stuff," he put a comforting hand on Steven's shoulder, "We both made a lot of mistakes when we were young. I thought disco was coming back, she started a war. I think she felt like she needed to confess everything to me, but I told her, 'The past is the past. All that matters to me is who you are now.' And who she was, was an incredible, loving being."
Looks like that was all he could get out of his father. Steven sighed. The only real way he could get the Yellow Diamond to change her attitude toward Earth for good would be for to figure out himself what happened to the Pink Diamond.
Steven had the weirdest dream that night. For a human at least. In his dream he saw a stray, abandoned palanquin, covered by vegetation, in the middle of a field. When he awoke that morning, he was sobbing. And he didn't know why.
Steven met Connie at the library, and told her the dream he had.
"I think I might have what you're looking for. I was here reading it last week..."
She searched the journals section for the book she was looking for. Pulling it off the shelf, she flickered through the pages until she found it, and showed it to Steven. It was a sketchup of the palanquin he saw in his dream.
"That's it! I gotta ask the Gems if they know about this!"
They took the book to a photocopier and made a copy of the palanquin drawing. Steven wondered why it took him so long to ask the gems about the Pink Diamond. Why didn't he think about asking them sooner, after Jasper was the first to bring it up?
He found an answer straight away. Amethyst never saw anything like that before in her life. Pearl didn't have much to say about either. The closest thing he got to a straight answer was from Garnet. Way to go, future vision!
"We're not going," she said, though Steven didn't show her anything yet.
"Why not? Is this something to do with Pink Diamond? I already know mom shattered her, so what is it about this that you can't tell me?"
"Rose never wanted you to see this place," she explained.
"But what about me? The only way (that I know) we can get the Diamonds off our backs is if I know the truth!"
Garnet sighed. It's one of those situations. If a superior says you shouldn't go somewhere, than you know it's got to be good.
"If you really want to go, I can't go with you," Garnet said at last, "I don't wanna be near...her."
Steven was confused. Only future vision would be able to explain. Garnet took off her shades, so that her eyes-all three of them-were big and sad and pointing toward Steven.
"Please stay. For me...?"
So the Crystal Gems weren't of any help. Steven had one more gem he could turn to: the Yellow Diamond. He found her sitting next to Greg and his van.
"I spoke to your father," she told him, "He was the last to see Rose Quartz, but even he doesn't have much to tell that I could use."
"Did he tell you 'forgive and forget'? Because that's sorta what he told me last night."
The Yellow Diamond nodded. Steven showed her the photocopy of the palanquin drawing. She inspected the paper.
"Hmmm...That's Pink Diamond's palanquin, all right."
"I saw it in a dream last night, and I figured maybe if I go there myself, I could get some answers. The others are telling me not to go. I still don't get what or why they're trying to hide from me. Also, I woke up this morning sobbing...Like I'm...doing...right...now...?"
Steven looked down and found himself sobbing again. So was the Yellow Diamond, apparently.
"UGH," groaned the Yellow Diamond, "This only means one thing: Blue Diamond must be close by. And I know where she's going."
"In that case, can me and my dad come with you?"
The Yellow Diamond stood up. Sighing, she said "All right. But if you see her mourning, I'd advise you not to disturb her until she's ready."
Steven and Greg joined the Yellow Diamond on the trek up the hill to the ship. There was her Pearl...and Ronaldo. Her fending him off is only giving Ronaldo more reasons to get into the huge ship and loot it for clues or whatnot to use on his blog. Steven walked up behind him, and tapped him on his shoulderblade. Ronaldo turned around.
"Ronaldo, I think someone went into your house and got into your blog," said Steven.
"WHA?" That was enough to send Ronaldo running, "That's the second time this week! YOU PUNKS ARE NOT GONNA KEEP THE TRUTH SECRET! NOT AS LONG AS I'M RUNNING THE SHOW."
"Recurring nuisance?" queried the Yellow Diamond.
"Nah, he's mostly harmless," assured Steven.
The ship took them to somewhere in Korea, where the stray palanquin laid to rest. As expected, the Blue Diamond and her Pearl were there. Steven and Greg were the first one off the ship, while the Yellow Diamond and her Pearl stayed on board.
"You go on ahead. We're gonna find a spot to land."
Steven and Greg stood behind a bush, keeping their distance while the Blue Diamond mourned. Steven knew her mom did something terrible. Whatever the Diamonds had in store for him, he was ready. At least, he thought he was. He just had to figure out how it happened, cause he knew the Blue Diamond would probably ask him that herself. In his head, he began to improvise a possible reenactment of the incident.
Meanwhile, the Blue Diamond continued to mourn.
"I'm so sorry, Pink. I could've done more. Yellow says it'll all be over soon. I wonder what you would think. This is your planet, after all. I still think it is."
Obviously, nobody told her about what Steven and Peridot did to the cluster. Yet. Steven and Greg watched as Blue's Pearl walked up to their hiding spot behind the bush.
"My Diamond," she said, "We are not alone," she she brought Greg forward.
Greg went for the best icebreaker he could think of in a situation like this, "So uh...were you close?"
"Very," said the Blue Diamond.
"I know how you feel. I lost someone very important to me, too. I miss her every single day, and I think about her all the time. But she's never coming back. That feeling can be so hard to be okay with."
As Steven watched from behind the bush, the Yellow Diamond came up beside him, her Pearl in tow.
"What did we miss?" Yellow's Pearl whispered to Steven.
"Blue Diamond's Pearl spotted Greg and brought him over. They seem to be...bonding over their losses. So far so good."
"Her mourning sickens me," said the Yellow Diamond.
Steven and Yellow's Pearl stayed behind as she walked up to Greg and the Blue Diamond.
"There you are, Blue. I thought I told you to stop coming here," she demanded.
"I'm sorry, Yellow," said the Blue Diamond, "I just had to say goodbye one last time before the cluster emerges," she set Greg in the palm of her hand and lifted him up to eye level, "And I met someone also in mourning. I didn't know humans could feel like we could!"
The Yellow Diamond was not amused, and for a good reason, "I know that. I brought him here, and he is not alone."
That was Steven's cue to come out. He hoped he had a good story all together.
"Hi, Blue Diamond, I'm Steven!" he said gleefully, "I see you already met my dad!"
"Your 'dad'?" asked the Blue Diamond.
"PHEW, someone who gets it," Steven sighed in relief, "Yeah, you need to have a little talk with one of your Aquamarines when you get home..."
"Steven is Rose Quartz's son," explained the Yellow Diamond.
"Her what?"
"Rose Quartz is no longer with us as well. Steven is all that's left of her."
Steven lifted his shirt, so the Blue Diamond could get a good look at his gem.
"Everything you guys said my mom did, she did," Steven announced, "And I wanna accept her responsibilities. All I ask is that when it's all over, please leave the Earth alone."
The Yellow Diamond whispered into Blue's ear, "I told him I'd give him a week before I decided."
The Blue Diamond knelt down in front of Steven.
"Steven," she said, "Do you, by any chance, know how Rose shattered Pink Diamond?"
"This is it Steven," whispered Greg, "Give them your best shot."
And Steven went ahead with the story he prepared.
"Uh...Rose did it on Earth, in front of Pink Diamond's palanquin. Rose was like, "Stop!" and she was all like "No!" So they fought...I think. And she probably did some cool moves. Rose had to do some cool moves too, some jump kicks and stuff, right? But Rose was most likely deeply conflicted about deciding to shatter her, cause I know I would. Definitely crying," then the kicker, thanks to what he learned from Bismuth, "Uh...Rose probably had to use the Breaking Point™ to do it!"
After a while of nothingness, the Blue Diamond sighed, and got up on her feet again.
"He knows nothing," she said to the Yellow Diamond.
"What? How do you remember it?" asked Steven.
"It was a SWORD!" she cried.
Steven didn't know what to say. He decided to run to the backside of the palanquin and have a word with the Pearls.
"I'll be right back," he quickly announced.
"What's with all the 'probably's and 'think's?" Yellow's Pearl demanded.
"And what is a...'Breaking Point™'?" added Blue's Pearl.
"I don't know anything, all right?" said Steven, "I just took an educated guess. Rose never told Dad about what happened, and the gems I live with are silent on the matter too. All I know is...Rose's sword was made to never shatter a gem."
"I knew it," Yellow's Pearl concluded, "That's why Blue Diamond asked you how it happened. Because how she remembers from witnesses, it doesn't make sense!"
Steven and the Pearls went back around to the front, where Greg and the Diamonds were talking it over themselves.
"Dad, something's not right," said Steven.
"I know," said Greg, "Apparently Rose shattered Pink as soon as she stepped off the palanquin."
"But weren't there any gems to keep her away? I mean, Rose was probably already despised at that point."
"She must've slipped past them," said the Yellow Diamond.
"But wouldn't her Pearl have cried out in alarm?" asked the Blue Diamond.
Steven started pacing around the area, and thinking aloud, "So whoever did this was already close to Pink Diamond. Someone her fellow gems would allow to get near her, someone she would listen to when asked to stop her palanquin and step outside, and then be able to cover it up afterwards."
Then it dawned on him. His conclusion: "Rose Quartz must've been framed!"
The Blue Diamond gasped. The Yellow Diamond, who was not as emotional as the Blue one, didn't. Steven settled himself on a nearby rock and began sobbing, while Greg went up to comfort him. He was very depressed.
"WHY, MOM? WHY DID YOU LEAVE ME TO DEAL WITH YOUR PROBLEMS?"
The Yellow Diamond did a quick check to see if the Blue Diamond was making him sob. No, she wasn't. But there were signs that it was on the verge of happening. Greg looked up back at the Diamonds.
"Don't worry. We'll figure out who did it."
The Diamonds parted ways then and there. Greg and Steven joined the Yellow Diamond on the journey back to Beach City. Garnet foresaw everything the minute Steven got home, and Pearl made him a hot cup of tea to make him feel better. Pearl, switching into comfort mode, gently patted Steven on the back as he sipped his tea.
"Share and enjoy," she said.