It's where gems are formed. Usually a cavernous space on a planet and mineral rich to help the growth process. [She leaves out the part where the process strips the minerals entirely. This is science talk, not newly found morality talk.] But people from Earth think it's some school where Earth children go to learn. It's ridiculous! Why would I be describing that when I refer to myself as a Kindergartner?

[Maybe because you look and act like one, Peridot.] It's entirely contextual, but they have to make their jokes.