Diamonds can be obtained for real money via online transactions to enjoy several benefits of the game. They can be used to rush timers or buy items at the shop.
Expeditions have timers that must reach zero before the treasure chest can be opened. Paying diamonds for the treasure hunters will make them rush the quest, returning with the chest immediately.
All items are alternatively available in the shop for diamonds. Spending diamonds will not decrease gold or essence, sparing them for the future. Currently experience boosts are the only items that cannot be bought for gold or essence: they are premium items and can be obtained for diamonds. Also you can buy Cosmetics
When buying Diamonds this can increase Vip level.