The (Deposit) feature for diamonds allows you to deposit a certain amount of diamonds for a set period of time.

After this period ends, you will receive a larger amount than what you initially deposited.
Several plans are available, each differing in terms of profit percentage and duration.

Please note that you will not be able to use the deposited diamonds during the deposit period.
However, you can cancel the deposit and retrieve your diamonds by tapping on "View" and then selecting "Withdraw Now".