If you're looking to sell them, you can hawk them in trade. I see people all the time hawking "any epic gem XX gold" and the idea is the person selects the gem and you buy it for them and trade it for gold. If you want to get it cut also, you'll probably have to team up with that guildy of yours. On my server, uncut the gems seem to go for 300 gold.
Good Luck.
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"the people can always be brought to the bidding of the leaders. That is easy. All you have to do is tell them they are being attacked and denounce the pacifists for lack of patriotism and exposing the country to danger. It works the same way in any country."
Hermann Goering, April 1946.