The gems have left to go a mission leaving Steven and Diamond to sleep.

Seeing the gems leave Diamond stood up and walked to the door he had seen them come in and out of. He looked at his wrists, each containing a large diamond. He put them up to two of the spots and the door opened revealing a blue and green room, grass and a hill. "Wow..." he whispered. He slowly walked in and the door closed behind him. "Well... guess I am stuck in here now." He said looking at the wall. He walked in farther until he was on top of the hill. There he stomped his foot down and a line of swords came up from in the hill. He stomped again sending them back into the ground. Then he stomped with his other foot and a few pairs of armor came up just down the hill, and just past that he saw a bed. He stomped making them go back into the ground then he sat and looked at the beauty of the room around him. It reminded him of being in the woods. He waved his hand and the door opened again, just in time to see the gems return.
"What are you... how did you..." Garnet stuttered more in shock than anger.
"I don't know, I put my gems near the door and it opened. I... it has only been a few minutes." Diamond stammered. Falling down from locking his knees and causing him to roll down the hill. He regained his ability to stand and walked out of the room, the door closing behind him.
"Garnet, did you know about that room? I have never seen it." Pearl asked, concerned.
"Yes, but I wish I could forget it." She replied. "Long ago there was a third gem that lived with Rose and I, their name was Emerald. He loved the outdoors, especially the woods and the meadow grass areas surrounding them. Anyway, he was a great fighter, but he..." she paused for a moment, as if she might cry herself then continued. "We were on the beach when a gem shark tried to attack nearby swimmers, he was hurt so badly he couldn't even retreat to his gem to heal. He died saving humans, his gem is kept safe. That was his room, but how could you have got into any of these rooms, you are not from this area."
"I don't know, I just put my gems to the door and it opened." Diamond said looking at the diamonds in his wrist.
"It is ok, I am just curious of why it opened to you." Garnet replied thinking of why the door had opened to him. "I think it is time you tell us what you are not letting us know."
"Fine." Diamond said taking a deep breath. He looked them in the eyes, "I guess to start is that you already know me. I was a good friend of Rose and her flag bearer, don't tell me you already forgot all that."
"Diamond...?" Pearl whispered to herself, covering her mouth with one hand in shock.
"Yes, it has been long time hasn't it. But there is much you don't know about me."
"I know you were a prisoner for quite sometime."
"Oh yes, but that is common knowledge. As you know there is command post on the moon, what you don't know is that it was mine."
"But Blue Diamond was here, why would there be more than one Diamond authority leader here?"
"I worked for her."
"But, you are a diamond..." she said confused.
"Yes, but when you are a diamond you are expected to never show a fault to those under you. I did, the council of diamonds were so enraged that I was demoted to the rank of a colonel, under the condition that if I could prove myself that I would regain my position."
"But why Blue Diamond specifically?"
"She and I had a great friendship and I knew it would be my best shot at redemption. So when I was coming to see her from my command post and I my ship was shot down and I was taken prisoner I realized that this place would not be a colony, not as long as I could still fight. After I was made a soldier under Rose I tried to convince Blue Diamond to scrap the plan. She would not accept, but because we were so close she let me leave alive, saying that she would neither tell the others nor fight me. Her army how ever would continue to fight the rebellion. I miss her now, but it just is how it worked out. I retreated into my gem under orders from Rose because she thought that homeworld would attack again, if so and we lost I would regenerate to be a defector. My time to regenerate came and homeworld had not come."
"We... we never knew what happened to you..." Pearl said.
"Well, now you know."