What you're going to do is quite simple. You're going to craft some of these:
Binds when equipped
Requires Level 51
Item Level 56
Materials needed per necklace:
1x Blue Sapphire
1x Essence of Undeath
1x Thorium Setting (crafted with 1x Thorium Bar with Jewelcrafting)
Each necklace has a chance to disenchant into:
Large Brilliant Shards 2.5%
Greater Eternal Essences 22.5%
Illusion Dusts 75%
Remember to not maniacally undercut when posting these things at the AH. I'm still selling my Greater Eternal Essences for 100g+, even though some desperate morons are trying to sell theirs for 15-50g. If the AH is spammed, you simply sit on your materials for a few more days. Any gold farmer with self respect should have enough bank space to handle that.
Now get your arse to the Auction House and start crafting!