Level your main character as a Strider until you get the ability "Master Thief". Then, walk the road north of Gran Soren just past the bridge until you find a random pawn. Use your "Master Thief" ability on him or her. You will steal two items from them. Occasionally these will be rare items, such as the Veterans Peridot. Run away from that pawn just enough so that they vanish from sight. Run back to them. You will be able to steal from them again. Repeat the process as many times as desired. Note: This is also a good way to steal quest items, such as the Sour Ambrosial Meat.