Talk:Garnet/@comment-24234815-20141206182719/@comment-25469541-20141207062628

Gems are shapeshifters capable of altering their bodies in any way they desire.

Canonically, they don't have any biological processes and everything they do occurs because of magic, meaning that they don't have any internal organs/blood. They are, however, fully capable of shapeshifting themselves to have certain internal organs if they want to. (The in-show confirmation of this is in In Fusion Cuisine, when the Gems elaborated on what it was like when they ate and described having digestive systems.) Following the logic that Gems don't have any internal organs by default, it's easy to come to the conclusion that Rose simply shapeshifted her body to have a reproductive system in order to have Steven. So there ya go.