Talk:Esper/@comment-10033036-20150424153000/@comment-25364614-20150425005126

You keep using the wrong terminology to describe things.

A Gemstone is an esper that obtained their powers naturally outside of AC's Curriculum.

In other words, the difference between them is the environment that the esper was in that led to them gaining powers in the first place: Inside AC vs Outside AC; Artificial vs Natural.

Basically, any normal human can potentially become a gemstone due to some 'still uncertain and unexplained' factors which AC tries to mimic. But this is exceedingly rare as there are approximately only 50 gemstones in the entire world.