In-case anyone hasn’t played Diablo 3 in a while and needs a boost to get their gear up to par, here is an easy way to maximize your money when using the real money auction house.
After you put your money into battle net, you can either by gold for .25$-ish per million, or spend 1-2 dollars on the highest level gems and re-list those on the gold auction house for about 20 million gold. You do the math, but that’s about 350% better than buying gold straight up. This is the way most people get their gold easily in Diablo 3.
Emeralds I believe sell for the most, but do a little research as the market fluctuates and see for yourself.