As you can see on the picture, the gems are available for purchase for 15 badge of justice each. The NPC that sells them are Shaani, a jewelcrafting supplier on Sunwell isle and is unlocked with the "Razorthorn Root" daily quest.
These gems will now be available from Black Temple (drop), Sunwell Plateu (drop), Magtheridon (drop in a gem-bag) and from Shaani (bought).
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Epic gems for badges in 2.4

The discoverys of patch 2.4 continues as it's now possible to buy epic quality gems for badges.
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Badges in my mind ////
Funny enough though, thinking of giving a Crimson Spinel an AH Value of 300g after patch 1 Badge of Justice is word around 20g then, so if you want to farm money, one Karazhan full clear will be worth way over 400g for you...
I agree though, that the system at the moment is crap, but instead of this they should have added a "gem token" that you can trade for a gem of choice instead of having the gems themselves drop in instances as most people need red socket gems anyways.
Poor people that bought tons of stuff for their badges like primal nethers.
=> You'll be able to get the gems for 15 badges, but the JC'ers will probably ask a few hundred gold to cut them, if you're not a Jewelcrafter yourself.
Vortex for badges update was as retarded as this, tho I already payed 750g per vortex to get belt of blasting qq
For someone who only plays WoW to have some fun in arenas not having to worry about getting gear at all would be so nice.
Adding new items accessible to the masses only means you have to spend more time getting gear to not fall behind. While this is the principle of MMOs, I'm quite certain that those who don't want to do anything besides arenas would be happier having an arena only version of the game than they're now.
They could even make you pay seperately for each version of the game, which would probably lead to quite some new subscriptions from those who want to play both versions :)
I've been wanting an arena only version of the very nature of the tournament PTRs since the start of season 1.
And then add the possibility to create servers yourself and suddently WoW tournaments will be featured at LAN events everywhere because the game is so ridiculously popular.
6g each - Still in need of that edit button ;)
I did, and i got laid since, you should try