I make my money mining in icecrown.

Saronite ore is 30-40g a stack on my server, titanium ore 25g -30g a ore.

Most gems (blue) are in the range of 50-70g, and perfect cuts of green are about 30g, normal gems about 5g-1g. I take eternal shadows, and eternal earth and creat crings for my JC to de, and then sell mats on AH.
Ive been making about today about 3k gold.