I was going to post this, Ive been doing it now for about a month and it is an excellent way to make some gold if you have the time and alts to do it. Basically it works for me like this.
1. My main is a JC'ter and I use his tokens to purchase the gem cut patterns. Things that sell wonderfully are the titanium spellshock ring and titanium earthguard band, among others you may find good sellers on your realm.
2. Level 70 alts that can spare a profession slot that you prob wont play for some time. I have 2 alts I did this on.
3. At least some starter gold, 2.5k would be handy. The thing about JC'ing and making big profits is being prepared to spend big. You now follow a guide and level the 2 alts to 375 and yes you will spend anywhere between 1 - 1.2k gold for mats for each alt if you want to reach 375 in 2-4 hours. Or start farming the mats, your choice.
4. Ride and get the flightpaths that will allow you to fly from dalaran to borean and or howling fjord ( this is not hard ).
5. Once you have 375 and fps get a port to dalaran and make sure you have at least 2 of each green northrend gem. Accept the quest from the JC questgiver and hand it in, bam 1 token...now accept the daily and fly to howling fjord for vrykul, elementals or dwarves...any other you may find hard Im sure youll have a friend tht can help for 5mins. Most you will find in howling Fjord or Borean and easy to get the required daily item from. Hearth back to dalaran and hand it in...Bam another token.
6. Exchange the 2 tokens you make on your first day for 2 dragon's eyes and either sell them (on my server they go for between 350 and 400gold = 800g return on the first day) or give them to your main JC'ter to go towards cutting a ring (as above) that can be sold for 2k+ on any given realm.
Now the ring patterns cost 6 tokens and your alts dont help with that what they help with is getting the four dragon's eyes you need in mats to cut them. The other mats required will cost around 250g at max if you buy them tho 8 eternals and an orb are easy to obtain. With my 2 alts providing the dragon's eyes and my main buying w/e patterns I can cut a ring every 2 days and they sell like hotcakes for 2 -2.5k gold everytime for little to no effort on making them.
If thats not your cup of tea, sell the eyes for an easy quicksell price of 250 - 300g a day but I suggest making the rings as they may become much cheaper come the next major patch. A 1.2k investment on an alt you have sitting around doing sfa that gets at least a 600g return in its first day and 250 - 300g everyday thereafter for 10mins work is a sound investment in my book. Make the rings and you're looking at a slightly riskier 2.2k profit every 2 days for 1hours work in dailies.
Good luck.