Talk:Sardonyx/@comment-29032475-20150708020414/@comment-29032475-20150708023219

If she really appears in only one episode then I guess the Pearl+Garnet fusion is the most likely possibility...

Or maybe a Homeworld Gem that Peridot contacts. Except she's still in Homeworld. (she'd either be seen through Steven's tv (magical disruption) or Peridot's touchscreen or something like that)