That uniform stuff is pretty amazing. There are a couple of other points that I don't think have been mentioned in this thread?

In the episode where the Gems go to the Strawberry Fields and find the old temple, and fall through the roof, there are four figures. Rose is portrayed with a star symbol, protecting people from a blue figure surrounded by diamonds (that's been pretty hashed-out). On either side of that main fight, there are two other figures, both with triangle-symbols. It's hard to tell in the screenshot I posted, but they are respectively white and yellow.

Finally, on Peridot and Jasper's spaceship, there is an insignia of three interlocking triangles - blue, white and yellow.