Jasper made Amethyst feel small figuratively and literally. But she could also help Amethyst learn that although Jasper is physically ideal, that's not all that matters. All Jasper knows about Earth is what she's been told, which is not much. Amethyst has an almost endless plethora of knowledge on Earths culture, which surpasses Jasper's by far. They could both learn so much from each other, and while doing so, form an unbiased, caring, indestructible bond.