REWARD depends on difficulty
EASY - Bronze Medal increases the number of flasks & jugs that can be harvest by 1
NORMAL - Silver Medal increases the amount of SP restored each turn by 100
HARD - Gold Medal increases the rate of triggering blitz offensives by 5%
EXPERT - Platinum Medal it causes the party to find 10 DIVINE SHARDS after battle.
if you want to fight MAIDAME CURIE again here's the reward
EASY - Forgestone (L) x10
NORMAL - Maid's Pouch x10
HARD - Ultimate Jug x10
EXPERT - Exquisite Jug x10