Quality Modifications
Ivory: +0%
Bronze: +1%
Iron: +2%
Mythril: +2%
Denadorite: +3%
Rainbow Shell: +4%
Type Modifications
Axe: -1%
Character Hit Modifications
(Based on the character's stated accuracy)
80%: +2%
85%: +0%
90%: -1%
The result of this is that essentially, the possible character accuracies are 82%, 85%, and 89%. Why they aren't displayed this way in the game is unclear.
From: Weapons (Chrono Cross)
