Been a leecher to long.... decided to post something that i found out a few weeks ago on the server i play..
Requirements: JC (obviously) and Blacksmithing for the gloves/bracer slot
1. Makes sure you have your bracers and gloves socketed so they have the prismatic sockets
2. Gem all your gear like you normally would (don't put in any JC gems yet)
3. Put JC Gems in all your prismatic sockets (Bracer/gloves/belt)
4. Go to your belt and put another JC gem over the one you have already socketed but don't socket it yet, put a JC gem over the normal Gem you have in your normal belt socket and then socket gems.
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5. Go to your Gloves and just like the belt put a JC gem over the already socketed JC gem but don't socket it yet and put another JC gem over the normal gem socket and then socket gems.
If you have any questions post them here and i'll answer them to the best of my ability...
Pretty sure this works on TC2 but the specific server i know it works on is Shadowmourne wow.
If someone could test this and post if it works on other servers that would be great.