Are the rings from jump tradeable?

Well, i was looking at the archer jump again and i realized that new archers get a ring. I also looked at warriors and mages and they also get a ring. So my question is, are the rings tradeable and is it worth the time invested in them?

No, they're only account shareable once, like the Chaos job items.

Do they stack with Lilin's/Resistance/Adventurer Ring? :/

Do they stack with the critical ring.

Nope at both questions.

No. But legend ring stacks with critical ring. It is 4 all stat and 3 att/matt.