DO NOT READ THIS IF YOU ARE NOT CAUGHT UP ON STEVEN UNIVERSE. THIS POST WILL CONTAIN SPOILERS THAT PERTAIN TO MY THEORY ABOUT WHAT HAPPENED TO PINK DIAMOND!!! YOU HAVE BEEN WARNED!!!
Now that the spoiler warning is taken care of let's get on to my theory.
I believe that Rose Quartz was not the one to shatter Pink Diamond. After watching the episode, The Trial, I believe it was actually Yellow Diamond that shattered her.
There are a lot of signs that point to my theory (at I think so
) During the episode you have Blue Zircon who is defending Steven. She starts to speculate what could have actually happened to Pink Diamond, and starts to go off on how Rose wouldn't have been able to get close to a diamond without her entourage noticing. This made me think that Yellow Diamond was the one who shattered her because she didn't want Steven to have a proper trial and just wanted to shatter him. Then when Blue Zircon started to speculate why Rose couldn't have shattered her, Yellow started to get angry and poofed the Zircons. So yeah, that's why I think it might have been Yellow diamond that shattered Pink Diamond, not Rose.