@RallyAllyCat spinel changed to be more edgy looking, and acting (until shortly after Change), because of how her abandonment emotionally impacted her, and it's shown in future that she's still a bit immature. and amethyst was overcooked so she came out the way she did, but the first time she reformed she must have taken time to give herself a new look. it doesn't really equate to mental growth. it was confirmed in the "how are gems made" short that gems totally skip childhood and stuff, and we know gems are made with adult mentality, even the most immature-acting ones. spinel is a neurodivergent-coded character and there's no need to infantilize her.
@Thorndrum pink steven is a new OS on the pink diamond gemstone that is based on steven but mostly emotionless, so while i get why u bring it up, the actual age of the gemstone isnt rlly relevant; human steven is virtually always fused with his gem half anyway, and steven is still a human minor. also we're using the word "pedophilia" informally as a general term, to refer to intimacy between adults and minors in general (like how the term "minor attracted person" is used) which is considered grooming and is bad.
plus su doesn't take place in the real state of maryland, it takes place in the fictional state of delmarva. and dang its 16? 16 is low compared to the usual age of majority of 18.