I've been really confused about this since I started getting my first attribute adding gems.
I am getting gems that add fire/bolt damage to a weapons. Still, adding that gem to a weapon doesn't activate flame/bolt visual effect.
I am wonder if those elemental damages actually work if the appropriate paper is not activated. For instance does a sword with +20 fire damage gem add the fire damage to each hit or does the +20 only increase effect of fire paper?
Also, assuming I use a weapon with fire damage gem, but no fire paper, do oil urns make the fire damage more effective?