User blog comment:AustinDR/Villains I Don't Like/@comment-27729149-20150730081041/@comment-27818776-20150730135003

I don't know about that. Peridot has done several things that make it debatable as to whether or not she can be redeemed. She tries to kill, Steven, a child, when she first met him even though he wasn't a threat to her mission, she was wanting to restart the Kindergarten on Earth which would've killed all the life on it, she also took part in forced Gem fusion experiments, she tried to kill Steven and the Gems several times, etc.

All I'm saying is that while it is possible for Peridot to redeem herself, the Crystal Gems wouldn't just forgive her without question, they would have to gradually trust her.