Are all gems female? I mean Steven is a male but I honestly think its because of his father... But wait isn't the reason he was conceived was because his mother gave up her physical form? How are gems created?@leox912
As Rebecca has said, Gems do not have a gender. Obviously, all the Gems you have seen so far have traditionally female physical characteristics, but if you want to get down to the science of the show canon, they are genderless beings. Steven is the exception, because he is half human. As for how Gems are created, I suggest you keep watching!