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Sometime in the rather distant past, Nene and Rui were on their usual patrol, walking around. Unfortunately for Nene, she did not know she was about to be on the other end of a rather confusing conversation.
Out of the blue Rui spoke, breaking a very comfortable silence, "Have you ever wondered why we're named the way we are?"
Nene stared at Rui with a baffled expression. "...Who would wonder that?"
"I mean, I suppose our gem is our 'real name', so I'd be Charoite." Rui points out, "Though that doesn't sound very right, doesn't it?"
"Of course not. I've known you as Rui my entire life." Nene sighed, briefly pondering why she was even entertaining this conversation.
"You're not even a little bit curious where Miku gets these names for us? Everyone's experience was the same, wasn't it?" Rui blinks.
"I was just told 'Okay Fluorite, your nickname is Nene,' with little explanation. I don't think anyone particularly cares about it."
"So if I was made of pink chalcedony like Emu, would I then be named Emu?"
"That's just wrong!" Nene shudders to imagine a pink-colored Rui that has wonderhoy as his catchphrase.
It was considered a little disrespectful to refer to fellow gems by their gem instead of their nickname, but Rui had run off with this idea and Nene felt like being blunt.
"Okay, Charoite," Nene said, voice completely monotone. "I will refer to you as Charoite from now on."
Rui gasped in mock offense. "I'm so offended! Truly, this the worst thing to happen to me, even being captured by lunarians is second!"
"...Are you being serious, Charoite?"
"Very!" As if to show how very serious Rui was taking this, the gold alloy began to leak out of his eyes. "See, this only happens when I'm sad. You are making me very sad, Nene. Sob sob."
"You're... okay, fine. I will call you Rui now... happy?"
The gold alloy returned to Rui's arms and he put on his brightest smile. "Yes, very. Thank you, Nene."
Nene groaned, suddenly feeling the need to lament Miku's choice of partner for her.
Meanwhile, in the not-so-distant present...
"If Miku gave us these names based on our gem composition, does that mean I have to go by Akito-Touya now, or something...?" Akito muttered, head in his hands.
Tsukasa reached for a nearby bowl, feeling an urge to smack the gem in front of him. "If you mention that one more time, I'm going to throw this at you."