Freedom from Identity
Of the three main Gems, Garnet’s story has always seemed the most muted and hazily defined. If you go back with the understanding that she is trans (as one of many dimensions to the metaphor she embodies), her whole character arc of learning to be honest and open about who she is, embracing her inner complexity and allowing herself to be vulnerable, it takes on a lot more color. It all starts to open up and make sense in a similar way to Amethyst’s and Pearl’s inner journeys.
From the start it’s just taken as read that Garnet is who she says she is. But she asserts this so strongly as to be rigid in her attitudes toward herself and her potential, and as to not let anyone in. She has to learn how to be a verb, and not just a noun. A person, not just an identity.
There’s this sort of fear that letting people know her too closely, or performing outside of this narrow definition she’s made for herself, will negate her identity, cause them to respect her less on her own terms. Which is not an entirely unwarranted fear, as we see in the show.
So her journey is about learning that essential trust in the truth of who she is, so that she doesn’t have to be defensive about it, protect it all the time. So that she can feel free to just live.