Diamonds can be used to speed up tasks (amount varies depending on time left), buy rare Potions from the Item Shop (the price will slowly increase and cap to 91 Diamonds), buy more Coins (the mall's level determines the diamond-to-coin ratio and is capped around level 50, so it is best to reach at least level 50 before buying) and buy more Workers (250 for the first one, then 500, 750, and so on).
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