Pearl's background in the extended opening

It's been a decade and I realized just now that when Pearl sings her part in the extended opening "I will fight in the name of Rose quartz etc..." while there is Rose's flag popping right behind her, in the background you can see two lines of DIAMONDS. The foreshadowing should have been so obvious, and I'm sure many people noticed it a long time ago, but me noticing it ONLY now was pretty shocking