Trying to get info needed to calculate the cost (in pgems)

[candlelight]

First, you can use something like this affix calculator to find the probabilities. Assuming the different desired affixes are mutually exclusive (that is, they all are or include a prefix, or they all are or include a suffix), you can just add up all the probabilities to get a single probability of a desired affix combination. If either a prefix or a suffix would be sufficient, it gets a bit messier to calculate.

Let P be the probability of a desired affix combination (if you have a 5% chance, P is .05).

3/P would be the average number of perfect gems needed to get such an affix combination.

3*ln(1-Q)/ln(1-P) would be the number of perfect gems needed to have the probability Q of getting the desired affix. Just plug in .75 or .9 to get those values.

Thank you, adeyke. The affix calculator was not in my list of LOD links, and its a helpful addition.

I'm exploring how much of a difference it makes to re-roll charms of a particular ilvl, versus other ilvls, and a few other such issues. I'll probably make at least one post here at LL once I've finished up with poking around with the affix calculator.