Houseki no Kuni - Questioning Your Gender
I see them as feminine boys (masculine way of speaking, feminine manner & lower body, I just can't see them as girls after hearing the way they call each other), but that doesn't change the fact that the show is marvelous. Clearly the authors want them depicted ambiguously to make ppl confused. For all we know, they might have a hermaphrodite third gender idk. Can gems even mate there? That's a question you don't hear everyday