High Level Gem Augmenting:

Find a good gem such as a Deep Ember then item dupe it, combine those and so forth. You can end up getting full level ember. Be warned, it will take quite a long time to do this (it took me a little over an hour to upgrade 10-20 embers). In the end enchanting your stuff a lot with the always good enchantments cheat and getting 3 slots and putting full level gems in makes you insanely powerful. I know this because my bow has 29 enchantments & 3 gems.