>>102541890No, they are benign liberals who defy an authoritarian dictatorship in order to preserve life that would be destroyed by the life-draining imperial expansionism of Homeworld.
Gems don't even have economy in the sense of humanity, thus socialism just does not apply as a term.
They are really about the liberation of Gemkind from the absolute control of the Diamond Authority, and preservation of the Earth (and presumably equivalent planets).
They are more like a green civil rights movement in an absolute monarchy than Socialists.