You want on every amulett
Int %
for the passives it depends.
For almost all builds you want any of this passives.
Inner Flames
Permafrost
Glass Canon (least favourable, cause you take more damage.) Also worse then you use Raiment Chest cause it allready has some +GA on Gear.
For Summon builds (Lightning Spear, Hydra, etc)
You want Primordial Binding + any of the above.
And only on a Summon Build you want to tripple crit Primiordial Binding
For burning Builds
You get one more great option with Endless Pyre, but it doesn’t matter really.
For Pyromancy Crit Damage Builds
You want Devouring Blaze with 3 times masterworking crit.
For all other buidls it doesn’t really matter what you crit on you amulett. If you crit 3 times one affix or crit Int% + one time every other passive. Except you have one of the 3 above + Icy touch, then you won’t crit Icy Touch at all.
With Conjurations Mastery gone it’s much easier to get a good amu now.