Well the last Method of rollback was going to Cain in act4 . and if you dont have a soul stone he will give you one. This was exploited and forced him to drop 1000's of soul stones causing the game to "rollback" this method has now been patched..... all you get is loads of lag when you do it and also get your CDkey Tagged.
for crafting people would get say 40 chipped gems .... try to make a cruel with them (3 chipped + sword) if you dont get a cruel then roll back..