"Pink Diamond/Rose Quartz held many secrets; from her enemies, her allies, and even her loved ones. And life has a nasty habit of of bringing such things out into the open, usually at a time that the truth will cause the most devistation. How would life for everyone change, when her secrets come out far earlier than planned."
So we know that gems can alter their forms at will, but depending on how dramatic the form they must put some level of conscious effort into maintaining that form; no matter how small it may be. And flipping one's own gem is bound to take no small amount of effort. Now, here is my challenge to you; what would change in the SUniverse if Pink's/Rose's gem returned to its original setting upon our star's birth?
-Steven's gem must be exposed as a Diamond to the Team.
-No, "They saw the gem and realised they didn't care" scenarios. There must be emotional conflict over it.