1. First, open the Free Fire game on your smartphone.
2. Now head to the diamond icon with the + sign at the top of the screen.
3. You can see a pop-up showcasing numbers of diamonds.
4. Select the number of diamonds you want to purchase (for example 100 diamonds).
5. Now you will be redirected to Google Play.
6. Here you need to choose Google Play balance as your payment method. You can also add your card details to make the purchase.
7. Once you are done hit the 1-tap buy button and you are all set to go.