I think the site 10 thousand things should work fine to give me 1 gem income in many different type :
http://dom3.servegame.com/wiki/Ten_Thousand_Things
If I am able to take a rainbow mage (archmage or better great seer of the deep) I will probably do it since it seems that I will have no need of an awake SC but many things to gain from a good magical diversity.