Board Thread:News and Announcements/@comment-27628871-20151218220901/@comment-26202330-20151227212042

RinTezuka62 wrote: Actually, in Catch and Release she says "Look over there, another planet to betray", and that's one proof she actually knows at least a little bit about what CGs have done. "Catch and Release" is a relatively new episode set long after "Jailbreak". It is possible she decided to do some research after having been harrassed by them for that long. In episodes such as the aforementioned "Jailbreak" (and the episodes following it shortly in the continuity) she seemed utterly confused over the name Crystal Gems.

Consider that she argued with Jasper about their change of plans in "Jailbreak" - if she had known Rose Quartz to be the arch-traitor that she was, she wouldn't have argued about it. Peridot was simply sent to Earth to check on the Cluster and the Kindergarten - she had been kept in dark about the possibility that the Crystal Gems could still be there.

Jasper, on the other hand, clearly knew. Judging by Peridot's reactions in "The Return" it would seem she didn't tell Peridot the real reason why she escorted her to Earth, either.