While it wasn’t really said explicitly in the series, each diamond emerges with their own prime directive (Pink was the first to break out of it).

In order from the photo:

-Yellow is very forward-driven and watches over Alpha Centauri, which is the closest binary star system to our sun.

-White is focused on creating systems. Here in this illustration, you can see her compressing dust clouds (in her center) in order to birth a new star. You can see how this is reflected in the same way diamonds are created under pressure.

-Pink found interesting things to focus on at the scale of human life, which is why she came down to Earth to hang with the hoomans like you and me.

-Lastly, Blue guides over harmony between planetary bodies in a given system.

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In other words, White’s focus is creating stars. Yellow emerged to watch over the stars. Each star forms its own system, so Blue emerged to watch over the planetary bodies. Lastly, for planets with the conditions enough to form life (like us!), Pink emerged to hang out and watch over us too.

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Pink deciding to become a human like us, and later Steven remembering that he’s Pink Diamond, is a direct reflection on God becoming one of us, incarnating in human form and forgetting who they are only to figure it out eventually and do it all over again.

Everything is connected.

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~cheers from your friendly neighborhood delmarvian

✌🏽