User blog comment:Goldensunsheba/I AM OFFICIALLY DEAD/@comment-27304481-20160810043227/@comment-26293141-20160810142200

It is very possible that Pink Diamond was the most arrogant of the four Diamonds, and that resulted in her being shattered in combat by Rose Quartz, she wasn't as cautious as Yellow, Blue, or White.

Or it could have happened like this: