Speaking of which, how would you like to add another 100-500 gold to your jewelcrafter's daily income? You may not realize this now but after a few days of experimenting I'm sure you'll come to realize that uncommon quality bloodstones and chalcedonies are your new best friends.
Whether you obtain these shiny rocks through prospecting or arbitrage, try selling five of each of the following bloodstone gems for 10 gold a piece: delicate, fractured, bold and runed. Also post ten solid chalcedony gems for the same price. I've had mixed results with +mp5 and +spirit so I tend to just stick to the sure selling +stam gem.
These red and blue gems (color not rarity) will almost never return to your mailbox unsold if you use a 48 hour timer. Good luck and comment on your own success or lack there of with these gems.