I’ve seen a lot of talk in youtube comments that many of the gems do not work, especially in weapons. Have you found out what works and what doesn’t?
So far I gathered (but not tested) that different damage elements do not stack, but I have no idea if elemental damage from enchantment stacks at least with the same element gem.
Any tips on what gem should I put into these? 
I havent personally seen anything that says yes these stack and honestly with the base dmg so small your only getting like 1 or 2 extra dmg anyways so maybe worth it on double daggers i havent mathed it out. But you got the infusion on a roll so your good
Seeing as you allready have a healing, a dealing, and a way for stamina refill i say go for a topaz to get some focus.
Nice roll btw
Many of the infusions that have seemingly low, flat amounts, scale with the item tier. So if you upgrade the item, or place in a Tier 3 item, the amount improves.
The flat values that don’t go up with tier, are the ones that directly change your character stats; like +Stamina, +Health, etc,.
