FTFY
Also, having put a gemstone on my assassin I must say it works very well, but it is lacking in a few circumstances. Because of the lack of HP boost on my assassin, I only have 720 hp (the lowest of any of my characters except an unmaxed samurai)
This means I regularly find myself at 400 hp, and sourcestones extra 110 hp definitely would make a nice difference.
Buuut… 6 def! And my assassin gets 45 def from that, making it somewhat more tanky for low damage shots. It’s an interesting balance. I find gemstone suits run and gun better, while sourcestone allows for more even play.