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There are more details online if you're looking for a specific attribute. That being said, clvl93 is ideal, but remember that gambling has a range, so even at clvl90, you still have a chance that the item you gambled is greater than ilvl90, but the odds are not in your favor. The correct formula for the crafted item level is:
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But really you still have a decent chance at lvl 90 or 91. To guarantee that you have a chance at this, you need to gamble amulets and craft with a clvl of 93 (93-5=88). So if you want to make a Caster amulet that has +2 to all skills, it needs to have an ilvl of at least ~88~ 90. When gambling an item, the item level (ilvl) is your clvl +4 to -5. It's based off of your character level (clvl).
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