Board Thread:News and Announcements/@comment-27628871-20151218220901/@comment-26202330-20151226180002

I don't see any reason to believe Peridot is a young Gem (other than wishful thinking on the side of certain fans). Just because she wasn't on Earth during the rebellion doesn't mean she hadn't emerged yet. The Gem empire is probably quite vast so it is just (if not more) likely that she simply was elsewhere during the events.