For bow archer, it's 10 for g7 and 11 for g8-g10 for all 3 elementals.
I used up around 40 odd sapphires before getting the proper amount on my armor.
Please, somebody tell me that maxing out other options like crits and evasion, using opal/peridot/garnet doesn't work the same way!

I've never tried this-simply cos i never seen any of these stones in game till now (bosses become miserly with drops if i ever go in party

So if say ur boots can have max of 30% critical hit..and right now it's less, will u have to go on adding the relevant peridot/whatever till it hits the correct number? or does it directly go to the max possible?