This guide is basically how to make lots of money with jewel crafting while playing the auction house. I have 375 mining and haven't had to mine once since I hit that and I make a ton of gold.
Step one.
Level jewel crafting to the level you can prospect at. I think its 330 when you can prospect adamantite. i bought all the mats to do this from the ah costed me like 800g.. was left with around 100g when I was done.
Step two.
Buy adamantite from the AH no more than 25g a stack.
step three.
Resell the gems simple as that