This is probably stupid but could it be possible that Peridot is wrong? What I mean by "wrong" is that she came out wrong. Because, while its true that she made fun of the crysta gems for being wrong but maybe she said that to feel better about herself, assuming that they've never seen another Peridot before. I'm saying Peridot is wrong because in "Together Alone," Blue Diamond says to Amethyst, "she'll need limb enhancers to meet her height requirements." So, if the limb enhancers are to meet "height requirements" what if Peridot is actually meant to be taller?