Gems are dropped by some monsters when you kill them. Your luck determines the likelihood of them dropping a jewel. Bosses seem more likely to carry gems, and can drop many gems when they die.
Take gems to the enchanter
Monsters that carry any type of gem
Succubi — found in the villa of Map 13
the Guardian Dragon — the boss found guarding the gate of Map 14
Dragons — found in the dungeon of Map 15
Death — the boss found in the pit in Map 15
Ruby
The ruby possesses the power of the element fire. The enchanter can use rubies to raise the fire power of your sword and your armor, while lowering the water power.
Monsters that carry rubies
Trolls — found at the rock on Map 3
Clouds — found in the volcano on Map 4
Gargoyles — found on the peak of Map 4
the Efreet — the boss found on the island on Map 9
Giants — found at the foot of Map 9
Wyverns — found in the nest of Map 9
Aquamarine
The aquamarine possesses the power of the element water. The enchanter can use aquamarines to raise the water power of your sword and your armor, while lowering the fire power.
Monsters that carry aquamarines
Kraken — found in the fishery in Map 7
Naga — found in the lake of Map 7
Poseidon — found at the floodgate in Map 7
Lizardmen — found in the territory in Map 10
Slime — found in the bog of Map 10
the Lizard Assassin — the boss found in the swamp of Map 10
Storms — found at the cape of Map 14
Emerald
The emerald possesses the power of the element wind. The enchanter can use emeralds to raise the wind power of your sword and your armor, while lowering the earth power.
Monsters that carry emeralds
Orcs — found in the forest of Map 1
Goblins — found in the shelterbelt of Map 2
Werewolves — found in the hunting grounds of Map 12
Topaz
The topaz crystal possesses the power of the element earth. The enchanter can use topaz crystals to raise the earth power of your sword and your armor, while lowering the wind power.
Monsters that carry topaz crystals
Sand Golems — found on the sand hill in Map 3
Golems — found along the mountain trail of Map 4
the Sand Worm — the boss found at the dunes of Map 6
Living Armor — found in the stronghold of Map 14
the Invisible creatures — found inhibiting the uninhabited castle — Map 15
Diamond
The diamond possesses the power of the element of light. The enchanter can use diamonds to raise the light power of your sword and your armor, while lowering the dark power.
Monsters that carry diamonds
the Neko — found on the plains of Map 1
harpies — found at the square on Map 2
the Snow Queen — the boss found in the palace of Map 13
Demons — found in the Steeple of Map 15
Onix
The onix possesses the power of the element of dark. The enchanter can use onixes to raise the dark power of your sword and your armor, while lowering the light power.
Monsters that carry onixes
Skeletons — found in the ruins of Map 1
Zombies — found in the tomb in Map 6
Mummies — found in the pyramid on Map 6
the Sorceress — found in the Hut of the Witch on Map 8
Will-o'-the-Wisp — found in the wetlands of Map 11
Ghosts — found in the grove of Map 11
the Necromancer — the boss found in the laboratory on Map 11
Imp — found at the house in Map 13
Vampires — found at the mansion on Map 14
Liches — found in Tower of Map 14