Currently there are TS Exp Gems in Tier 6 of Gemcrafting. The recipe costs 250 credits to purchase. Each gems costs approximately 800 fragments and 10 Credits to make. The benefit they provide is +1 TS Exp per gem on each tradeskill attempt. The maximum TS Exp that can achievable with these gems is 140 exp per attempt (100 base exp plus 40 slotted gems in full artifact gear including shield, amulet and ring).
That's what's currently in the game. What I am suggesting is that a Tier 12 gem be added that grants the exact same exp bonus but also includes +1 resource gained per gem. The recipe cost would be 500 Credits with the gem materials being approximately 1600 fragments and 20 Credits each.