how is gathering in diadem?

i have never done it do the modes differ also when it comes to gathering?

Do not believe the modes differ. Although only technically done it on Normal. Can be quite challenging since stealth has no effect so you must be sneaky when attempting to gather or you will be one shot by a monster. Cannot tell you how many times I perished until I got the hang of it :)

seems to me like it'd be easier in nm/hm just because you can follow zerg parties around and mine/harvest while they're killing stuff

there's almost no one in easy tho so it's harder in there