Say I have a chest piece with 3 slots. I could either be a JC, or I could not be a JC.
If I was a JC, I could use 3 34 stat gems. That would be 102 stats. However, if I was not a JC, I would use 3 20 stat gems. The net gain from being a JC is 42, because even if I wasn't a JC, I could have...