I know a lot of people struggling for gold right now, especially with some of the higher content enchants an example is the berserking enchant costing 1400g on my server is driving my arena partner rogue insane. Anyways this is the easiest way without doing daylies or farming eternals.
What to do?
Look up AH price of Infinite dust - Hope for 4.5g each to about 5g
Look up price of Greater Cosmic Essence - Double check its 25g +
Look up price of Eternal Earths - Anywhere in the 5-6g range is the best
Stonegaurd Band is a green ring that jewelcrafters can make and the mats are 2 eternal earths each.
Buy EVERY eternal earth you can for 5-6 gold then get a JC friend to make you as many rings as possible.
Step two: The disenchanting procs for the ring are...
75% Chance: 3.5 Infinite dust (Range of 2-5 on every disenchant)
25% Chance: 1.5 Greater Cosmic Essence (Range of 1-2)
1% Chance: Dream Shard
Give your rings to an enchanter and have them all disenchanted, cross your fingers and hope for lots of greater cosmics.
Lets do the math:
Investment: 200 eternal earths for 1000g
100 rings made
75 x 3.5 = 262.5 Infinite dust
25 x 1.5 = 37.5 Greater Cosmics
Assuming no or few dream shard procs
262.5 x 4.5g (Assumed Infinite dust price) = 1181.5 g
37.5 x 25g (Assumed Greater Cosmic price) = 937.5 g
1181.5g + 937.5g = 2119g
Subract the initial investment 2119g - 1000g = 1119g gold gained
Considering this took 30 mins of your time and my enchanting mats sell as I put them up, its a great way to make money while doing other things.
Hope this helps please post any comments!