I waited this episode for months! I waited to see Yellow Diamond, in Steven wiki, it portrayed as a young and feminine looking person, I just hope, that a famous actress gives the voice of Yellow Diamond. Well... my hope is lost, however the singer woman gives it a ruthless voice somehow.
Anyway, episode begins with CG discuss their next step with the Drill, Peridot enters the barn, they are heavily frustrated by what they saw in Moon. Steven follows Peridot and trap her in the car. I tried and Psycho theme makes this scene better. Later Steven gets sad about it, but before he knew the purpose of the communicator. After a brief talk, Peridot is released itself and attack the Earthern gems. Followed with a little chase and clashing, Peridot gains the communicator and falsify her calculating nature as Peridot motivated by the zeal of YD.
Peridot successfully activating the communicator and Diamond appeared. First reaction: Ugly and old Her voice seemed fair. They engage a conversation about the events, and YD here are pretty fair with Peridot, Diamond will send a ship to her, before the planet defeated by the Cluster.
Peridot rejects it and stand up for Earth, YD accept this as treason and gives it a last chance. I do not think personally, that YD is ruthless or cold-hearted, it just went angry as every ruler, when experienced the revolt of subjects. Clearly YD seemed fair and cunning in the first appearance, but later and the mentions are not give the portrait of the proper leader... sending 5 total fool Ruby and sent Jasper with no meaningful force to Earth, it means, that YD run out of soldiers or it does not spare any servant, second is the less possible. YD is a bad ruler overall, I am eager to see the other Diamonds, if they alive and not predecessors of YD.
As a final revenge YD wants to explode the communicator, but in an awkward scene, which showed Pearl and Amethyst silliness or panic, they nearly died... only Garnet and Steven saved them, and Peridot became a traitor.