Okay, so I wanna reroll rare circlets diadems and coronets with pskulls, is this worth it or does the reroll drop the quality of the rare each time.

Is it .4(ilvl) + .4(clvl)? I saw this but can anyone confirm?

The formula given above is correct.
If you keep rolling your item, its iLvl tends to (2/3) x CLvl (char level).
Check the iLvl required to spawn your highest desired affix, check if your CLvl is high enough for that.

Diadems? Thought they had a different calc... but... I have noticed some things when re-rolling them... mind you... been awhile

anyone tell me how to check i lvl and if its okay to do? ty

You had to know where item is dropped

someone told me that diadems don't lose item quality when re rolled can this be confirmed

This post was edited by Lavince on Jul 9 2016 09:24am

Item quality = inferior / normal / superior / magic / rare / set (mavina) / unique (Griffon's eye)
Indeed, item quality doesn't change when diadem is rolled (magic with p.gems, or rare with p.skulls or skull+SoJ).

But obviously you mean "item Level" (iLvl).



To both :
There is no special rule concerning diadems. iLvl may vary while rolling (increasing, or decreasing, or staying the same, depending on the situation).

What's special about diadems is that any affix is always available, at any iLvl.
Example : an iLvl 1 diadem may spawn with +2 class skill.
This is due to the high "magic level" of diadems (MLvl = 18), as found on different items (other circlets, non-elite wands, staves, orbs), combined with a high "quality level" (85, almost the highest).
Check :
http://classic.battle.net/diablo2exp/items/circlets.shtml

Now be careful, however : Mechanic's prefix, that allows 1/2 sockets randomly, and is always welcomed, can't spawn 2 sockets if the iLvl is too low.
In other words, you'll have 100% chance of 1 socket (instead of 50/50).
This happens when iLvl is 25 or lower.



You still didn't tell us what you are trying to roll.
Assuming you roll rare diadems with 6 skulls, and hope for +2 class skill and 2 sockets, all you have to do is use a char level of 40 (or more).

^^^ the realest t4t