Boom Beach: How To Get More Diamonds
Diamonds are the most valuable currency you'll utilize in Boom Beach. You can use these to expedite the creation of a building within seconds. You can also use them to purchase resources directly, in case you don't have a mine or a quarry readily built.
When it comes to finding diamonds, do some research around the islands. Sometimes you'll find them randomly popping up on your map. Otherwise, the best way to get them is to complete Achievements within the game (for which you'll receive a small but subtle amount) and successfully defend your base from enemies.
If you prefer, you can buy diamonds directly through in-app purchase, ranging anywhere from $4.99 to $99.99 depending on how many you want. Your best bet, though, is to try to earn as many as you can up front, and then decide on the secondary purchase only if your situation calls for it. Most of the time, you can get by with what the game provides, but the decision is yours.