Alchemy and Enchanting are two professions that don't normally go together, but if you like to make potions and you like to enchant things, you're in luck!
The object in question is the Lifebound Alchemist Stone. This is an epic quality item, which (depending on your realm), costs about 700g-1,000g to make. This can be disenchanted to a Maelstrom Crystal, which are selling for around 2,000g each. Fairly simple process, although you may move one or two a day; most people aren't willing to put BiS enchantments on heroic blue items.
HOWEVER we could take this one step further with the Enchanting pattern: Magic Lamp. This is a non-combat pet which can only be made by Enchanters, and it requires one (1) Maelstrom Crystal. See where I'm going with this?
You could make 2 Lifebound Alchemist Stones, disenchant them, sell one crystal, and use the other to make the Magic Lamp. Other materials may run you 200-400g to make the Lamp, but I've seen them on the Auction House for upwards of 3,000g.
Cliffs (short entry but I promised cliffs where applicable):
-Alchemy: Make Lifebound Alchemist Stone
-Enchanting: Disenchant said Alchemist Stone, either sell the crystal or make a Magic Lamp
-Sell the Magic Lamp for more gold