Clash of Clans - Building - Resources

In Clash of Clans there's 4 different resources that any players can collect to use to purchase buildings, upgrades, troops or battles! Those 4 resources are: Gold, Elixir, Dark Elixir and Gem! Some resources are stored into their own building except the Gem! Gem are available to be purchased with real cash money! They can be earned by completing Achievement or remove Obstacles from your City Land!