Hello,
welcome to my Gem guide!

I wanna explain you guys about Gems!

What are gems?

Gems are items that can be used to put in a weapon or armor..
They make your Weapons and armors much stronger and thats why they are very important
On high levels, your armor/weapon sucks if its not forged with gems.

Where do I get gems?

Gems can be mostly earned by mazes.
list:

Forsaken City
Elite Wailing Warrior - Fiery Gem, Furious Gem, Refining Gem
Wailing Archer : Shining Gem, Glowing Gem, Refining Gem
Sorrow Warrior : Fiery Gem, Furious Gem, Refining Gem
Sorrow Archer: Shining Gem, Gem of Colossus, Refining Gem

Dark Swamp
Swamp Watcher : Shining Gem,Glowing Gem, Refining Gem
Swamp Man - Spirit Gem, Refining Gem
Swamp Warden - Explosive Gem, Lustrious Gem, Refining Gem
Swamp Bog : Spirit Gem, Shadow Gem, Refining Gem
Cursed Mummy - Spirit Gem , Refining Gem
Crazy Mummy - Explosion Gem , Lustrious Gem, Refining Gem
Elite Wailing Warrior : Fiery Gem, Furious Gem, Refining Gem
Wailing Marksman : Shining Gem, Glowing Gem, Refining Gem


Demonic World
Imaginary Snow Doll : Fiery Gem, Furious Gem, Refining Gem
Snow Doll Spirit -Shining Gem,Glowing Gem,Refining Gem
Evil Snow Doll Spirit - Spirit Gem , Refining Gem,
Confesed Snow Doll - Explosive Gem,Lustrious Gem,Refining Gem
Demonic Snowman - Fiery Gem, Furious Gem,Spirit Gem , Refining Gem
Demonic Yeti -Shining Gem,Glowing Gem,Explosive Gem,Lustrious Gem,Refining Gem
Snowman Warlord - Fiery Gem, Furious Gem,Explosive Gem,Refining Gem
Wandering Soul - Glowing Gem,Spirit Gem , Shining Gem,Refining Gem
Wandering Soul -      Glowing Gem, Spirit Gem, Shining Gem, (Refining Gem)
Snowman Warlord -   Fiery Gem, Furious Gem, Explosive Gem, (Refining Gem)

Black Dragon Cave
Black Dragon - Heart of Black Dragon, Soul of Black Dragon, Eye of Black Dragon

And a lot of Sea monsters! (Most of them so)

What else can I do with gems?

You can make them stronger.Take a Fiery Gem.. normally they are level 1
But if you combine them you'll get a lvl 2 Fiery gem..  
If you combine 2, level 2 Fiery gems you'll get a level 3 fiery gem.

How can I combine gems?

At the Shaitan Grocery shop.
Things you need:
1 composition scroll (costs 5k and can be baught at NPC Amos) , 50k, 2 gems.
Like i said before..
gem lvl 1 + gem lvl 1= gem lvl 2
gem lvl 2 + gem lvl 2= gem lvl 3
gem lvl 3 + gem lvl 3= gem lvl 4
gem lvl 4 + gem lvl 4= gem lvl 5
So you need 16 level 1 gems to get a lvl 5 gem.



What gems are out there?

Gem name:                                Gem Effect:               Forged into:
Lv 1 Soul of the Black Dragon         Gem Bonus Physical Resist              Armor, Shield
Lv 1 Eye of the Black Dragon         Gem Bonus Attack +50                 All Weapons
Lv 1 Heart of the Black Dragon         Gem Bonus Max HP +500                   Shoe, Gloves
Lv 1 Shadow Gem         Gem Bonus Dodge +2                         Weapon, Shoe
Lv 1 Lustrious Gem         Gem Bonus Hit Rate +5                          Weapon, Gloves
Lv 1 Gem of Rage         Gem Bonus Strength +5                           All Weapons
Lv 1 Spirit Gem         Gem Bonus Spirit +1                          Weapon, Shoe
Lv 1 Shining Gem         Gem Bonus Max HP +100                     Armor, Shield
Lv 1 Glowing Gem         Gem Bonus Defense +5                     Armor, Shield
Lv 1 Fiery Gem                    Gem Bonus Attack +4                      Single Handed Sword
Lv 1 Gem of the Wind   Gem Bonus Agility +5                        Shoe
Lv 1 Explosive Gem          Gem Bonus Attack +10                          Firegun
Lv 1 Furious Gem           Gem Bonus Attack +6                     Greatsword, Bow, Staff, Dagger
Lv 1 Gem of Striking           Gem Bonus Accuracy +5                Gloves
Lv 1 Gem of Colossus         Gem Bonus Constitution +5              Armor, Shield

Thanks for reading! Hope you learned something!
Hope it is a good entrie