So, I think it's pretty much been established (by the fanbase, simultaneously) that the two corrupted gems that Jasper poofed were corrupted Jaspers. I think it's safe to assume that Rose knew them.
Sidenote: Does anybody know what episode Bismuth is appearing?
Rose:"When a gem is made, it's for a reason. They burst out of the ground already knowing what they're supposed to be, and then... that's what they are. Forever. But you, you're supposed to change. You're never the same even moment to moment -- you're allowed and expected to invent who you are. What an incredible power -- the ability to 'grow up.'" Now we know how much we know! But Rose missed a crucial part. They burst out of the ground already knowing what they're supposed to be, and then... that's what they are. Forever. But you, you're supposed to change. Gems do grow up. They grow in personality, spirit, and knowledge. That's what is difficult for Emeralds. They don't know what they are supposed to do, where to go, how to even figure out any of this. 1st Emerald had a bit of an advantage, he could've been a lot worse. Some Emeralds are closer to half-corrupted Centipeetles.