Yeah I manage to use GG on this one and it's a tideous one as you will only have a few seconds of window to actually do anything, then game restarts and the gems that you modify will be on a new string..the only thing that is worth doing after editing the value of gems is to convert it to rocks and gold as the value on those stay and won't roll back when game restarts.
**Note: if you try to modify rocks and gold coins straight.. game will restart and roll back.