if your gem is male that's fine an ok and i dont mind at all.
Gems canonically have only used she pronouns and dont really have a construct regarding gender. But if your gem is male that is awesome and continue making great oc's ok.
Edit: if there do happen to be gems that identify as males, please don't be a dick to me. I'm not talking to any individuals, just in general because as of now gems have only identified as females so yeah
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How to Make A Steven Universe OC
RastgeleI've been more interested in Steven Universe lately, so I thought I might make a book to help others in the fandom make a Gem OC. :^> EDIT 7/15/16: I don't plan on updating anytime soon. There may be some inaccuracies in this guide so be wary :0