The irony is, at the time this guide was released, the show itself hadn't revealed that "Quartz" was an overarching category! The viewers didn't know, Steven didn't know...they could've left that line off of everyone's profiles, and nobody would've thought it was strange.

Then a few months later we would've gone "aha, they were obscuring this technical spoiler about Gem species, how clever." And a few years after that we would've have gone "heyyy, hold on, they were straight-up lying about this major spoiler about Rose."