Diamonds are the hardest currency to come by in the game and can be used in the store to buy card packs, tape bundles, and time skips.

You can also use them to automatically buy any resources you're lacking when trying to upgrade characters or hangouts.

You can get more diamonds by:

• Completing the showdown and reaching the diamond rewards
• Hitting friends bonuses on hangouts - low chance
• Completing goals - some of them have diamonds on their rewards
• Logging in to your Facebook account for the first time within The Goldbergs settings menu
• Buying certain offers or diamond bundles in the store
• Completing milestones on most events