Diamonds are the premium currency in Boom Beach. They are used for increasing production speed (i.e. finishing off production and upgrades instantly). You can also use them to replace any of your resources when required, so are very important. Unlike most free games, Boom Beach is very generous when it comes to giving out Diamonds. You get a healthy amount when you start the game (currently 50), and receive more from opening chest on the map screen, completing achievements and successfully defending your base. You can also purchase them using real money, but it's very refreshing that this isn't necessary to make good progress in the game.
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