What does the mushroom farmer say when you talk to him?
The crystals are named for the resistance they boost, so it should be easy to open the charatcer's inventory and watch the resistance value while you drop a crystal in, or remove one. From small to the largest size, they boost their respective resistance by 2, 4, 6, 8 or 12 points.
charm effectsAlso, charms and crystals are both described in a section of the
Strategy Guide.
Check your PM (click '
My Home' in the top menu bar, then 'Received Private Messages').