I've been i the server discord and they say they auto-ban if you have 1kk gold. So I suppose certain amount of gem will be the same, so gem hack is not safe at all.
İt was work for a moment but after play a hours when u closed game and try join back game stays % 30 later trying 2-3 time and just got ban and i was not even open all mods i was just used x20 dmg god mod thats all and again got ban looks like we cant play this game with hack its realty.
I've been using mod since version 0.0.6 Banned once (cause I used Gems hack) since then I've just playing normally in online town, farming everywhere, killing all boses. The ONLY thing I've been careful with is MOV SPEED IN TOWN cause well obviously you can't be showing yourself to people that you have some kind of hack. I have 2 characters a lv 34 and another lv 25, I use guest account and this is my mod config. :
If you've already been banned before, if you just reinstal the mod you will get ban again. There are some steps to follow to unban your account found by a member in this thread. If thats your case search for it.