Its the pirate istance open? if so getting gem is easy, there is a wheel you can use inside (i dont remember where you get the coin for but i think from dailies), the weehl will give maxed out gems of every colors (no drop tho, so you cant trade em). You also get gem from the mineral nodes iirc. Been quite a bit ive played it.
Never gotten a single gems from nodes, just quartz for crafting. And the pirate instance isn't opened, I didn't necessarily mean endgame gems, I meant like leveling gems and shit, there's a profession that makes jewelry and gems, but I didn't really see a way to get gems to get the gem fragments to craft for the profession, which was pretty dumb. The whole thing feels incomplete, probably partly because of the 2.0(or 3.0 whichever it is) patch reworking a lot of the basic stuff. AH is filled with old content items too it's annoying as shit, they should remove that from our version since we're never getting those old items.
Crafting is weird too, maybe because of the 45 caps. But basically, nothing is worse doing but Soul Shield crafting and Pottery to go with it. Pottery makes the items literally every other craft needs, as well as the quest stuff. Soul shield makes soul shields obviously which are surprisingly good but weird, basically you only craft one piece, so you can't have a 8pc bonus, however the one piece you craft has stupid high stats, like the moonwater soul shield has 235crit on it, while the Jianshi 42 blue set tops off at 93 or so, so that means you get 5pc+crafted+2random pieces but they also get Transformation Stones as their key item and that shit sells like hot cakes since you need a bunch to upgrade your gear.
The other crafts are weird cause they get shitty items. Like they get to craft repair tools/keys/unsealing charms but tier 1 makes the same as tier3(just less per craft so lower output, but also lower cost since it uses tier1 materials), only repair tools have a tier3 version with field repair tools but those are stupid expensive. Then you have like weapon/jewelry crafting which feels useless since Hongmoon gear is better, TP seals which are useless since you can TP everywhere anyway, slightly better potions that might be on different cd but not sure, only one type of food(crit+health regen) and so other than gems which seem weird atm and like poison curing potions and rezing charms, I don't see much use in the rest.
So basically, it makes the most sense to be Pottery/Soul Shield+Tree/Herb, which I guess what everyone will pick, so it'll drive the prices down, but it'll probably still be better than the rest because transformation stones aren't obtained in any other way(repeatedly, you do get a few from story quest/survey) and you need a large amount and F2P players probably won't have the money to spam crafting/gathering and level it for themselves. Then you make like a mule for repair tools/unsealing charms with Tree/Herb gathering, can get up to tier2 at lvl 11 for gathering, sadly need to do the story to get to the 3rd tier area but with how fast the leveling is, it'd probably only take like 8hours or so if you rushed it.