I would say that Carnelian gathered the very little information she has now from a small notebook in Candice's motorhome. The small notebook would only inform her of the existence of gems and humans. That's all that Carnelian knows, but the rest of the notebook is coded so that only Candice or anyone working with her would understand, and to anyone else (who isn't a newborn), it would look as though she was either writing nonsense while trying to draw a comic book (and failing).