So, today I will talk about the Diamond Murals
Let's start with Yellow Diamond. She has two Spikes on her hair. She has access to all of Homeworld's army acording to Peridot in Hit The Diamond.
Then let's go to Blue Diamond. She has three spikes on her hair. She seems to be the aritocratic one and seems to be as important as YD.
Then Pink Diamond. She has four spikes on her hair (The one next to her cheek doesn't count). So far all the gems we know are hers are quartzes.
Now White Diamond. She has five spikes on her hair. Nothing is known about her, but she seems to be important and powerfull too.
But wait... We don't count "2, 3, 4, 5". Where's One?
I know where. I know who the missing Diamond is, and that it was right there and no one noticed.
The missing diamond is...
LOOK AT HIS HAIR! ONE spike! Onion is a Diamond confirmed!