Seriously,

Okay, so another Steven Universe Recap, but an extension to an older one.

 "It's still the gems" was about how Ronaldo said that Polymorphic Sentient Rocks  were here to hollow out the earth, and that they were part of the great diamond authority. They'll take on any form... 

Hmm...                Kindergarten                 Gems           The Return       Keep It Together 

OH CRAP THE DIAMOND REVOLUTION IS COMING!!!! 

That's what I missed. The fact that it is still the gems and that he's right frightens me...