combine it with (dis)enchanting and alchemy (transmuter) and ull easily do that. ofc u wount get stuff sold in 1 hour, but for 1 hours work you can easily make 20k from jc.
buy 80 stacks of elementium ore, prospect it, transmute carnelians to infernos, make rings/necks with teh green gems(nightstones etc.)
then disenchant those, transmute infernos cut the remains and put on ah. if its a decently populated server, you will get atleast 70% sold without re-undercutting, and just letting it stay on ah for 12h.
if u wanna make extra much, then buy the ores on monday or sunday, maybe 100-200 stacks depending on how much u can afford and how much there is on ah. do the enchanting transmuting and cutting, then wait until wednesday around 14-15 on the afternoon, then put it up on ah, and ull get rich
made alot of money like this, then i realised i didnt really have anything to buy anymore, lol. got all the valor items for my alts, got all the mounts i can buy, and there are no boe's worth using from ds, so atm im just spending it on epic gems
making like 10-20k/week when im boored, but its not that fun when u have nothing to save up to:P
edit: irt darkfriend: beltbuckles are indeed a good profit too. much better at start of 4.3 though, nowdays it has slowed down ALOT.