I rewatched the series recently, and there honestly isn’t a point where she goes from stoic to unstoic. In her first starring episode she is revealed to feel deeply, she shoes excitement periodically throughout when she splits or reunites, and otherwise is calm.
I think its people seeing her as less mysterious once the backstory was explained and conflated it with losing a stoic demeanor.
I mean she does express herself emotionally more often, smiles more, and doesn’t constantly use a deadpan tone of voice as much as she used to. Not that I think this is necessarily a bad thing.
Brayden Lewis
Also she cracks jokes more often than she originally used to. Not nearly on someone like Amethyst’s level but Garnet has developed an actual sense of humor.
Brandon Sanchez
Huh. Now that I think of it, she usually had a slightly higher inflection when talking to Steven even in S1 unless she was trying to give him a lesson on something. The deadpan was mostly for the other Gems, can’t remember how she spoke to Greg.
Next time I rewatch I’ll have to pay attention to who she speaks to the most. It may just be she had more dialogue with Steven.
Chase Nelson
I don’t think Greg has interacted much with Garnet in the show. It seems like Pearl is the only gem to have a decent amount of chemistry with him (outside of Rose/Pink Diamond)
Jordan Murphy
Remember when Garnet was a character in her own right and not just a person shaped car that Ruby and Sapphire walk around in?
Isaiah Rogers
Its odd, we know Amethyst used to spend a lot of time with her and Vidalia, probably others given how throughout she’s very aware of Earth culture and style but we never really saw it.