Get Diamond Emotes Trick in FF - Google Opinion Rewards app is among the easiest ways to earn free diamonds in Free Fire and Free Fire Max. The app rewards users for taking part in surveys. For each survey, Google gives some Google Play Credits or iTunes gift cards, which you can then use to buy diamonds in Free Fire Max for free.
Since Free Fire and Free Fire Max are not available on App Store, iPhone users cannot use their iTunes gift cards to get free diamonds in the game. That said, the Google Opinion Rewards app is available for download on both Android mobile phones and iPhones via Google Play Store and App Store respectively.