Notes:

Dear God, did he just shatter a Gem? It's shiny, cracked, and he looks horrified.

Who did he just kill? It's not Jasper, or Pietersite, or a Rose Quartz… The gem has streaks of magenta and cyan, kind of like mother of pearl… Did he just shatter a Pearl? Pink Pearl? She was part-cracked to begin with…

Well if you wanted something that would corrupt Steven into Worm Boi, murder would do it, in spades.