Basically, Peridot is a big prude who is too bound up in her own head to explore and be comfortable with her body the way it is (yes, this is vaguely gross, but itās also like, half the point of the show), and eventually grow into understanding what it would be like to have a free, loving relationship with herself or another person. Like, say, Amethyst.
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Peridot plays the angsty teen to potential love interest Amethyst here, which is interesting since usually the teamās angsty teen is... Amethyst. Amethyst instead gets to be a different kind of teen, alternating between āovertly chillā and āupset at Peridot,ā which manifests in a delightful noogie. Amethyst, who has always been the youngest Gem, now has the opportunity to be cooler-than-thou, the way a college sophomore can pretend to be extremely worldly to the incoming freshman because he smoked a joint once at a Chance The Rapper show. Except that her speech about Peridot being who she is, rather than who she could be, stinks of maturity and the lessons sheās learned over the course of the show, especially relating to her own relative deformity.