STR +4, DEX +4, CON +4, INT +4, WIT +4, MEN +4, CHA +4, LUC +4, Skill Mastery Rate +30%. Effects of two identical jewels do not stack; the higher-level jewel takes precedence. Equip various greater jewels to get additional effects.
A superior jewel can be obtained through compounding of two jewels of the same level.