I can do a search, either known values or fuzzy, and pin down the address of the gems. Say I have 208, I'll find a couple variables, pick up a couple gems, keep tracking until I'm sure of which variable it is. I can then edit the value and lock it, but it doesn't change the value in-game. In fact, I'll go back into GG, and the variable, despite being locked, will have changed to something else. I just can't get anything to stick.
On a couple occasions I've been able to get the gems to change on the HUD, but not to a static number--it will just rapidly scroll between thousands of numbers. And either way, it doesn't actual reflect my gem totals when I go to make a gem purchase.
I've tried some other things, like pinpointing the value of the gem cost of a chest, changing it to a negative value, and still nothing. I just don't know what to do.