One of the first surprises in Free Fire Beta is the generosity: the test server hands you diamonds and unlocks that would cost real money on the live game. Here is how test-server rewards actually work and where the limits are.
Why the beta gives you diamonds
Testers need to try premium characters, skins, and loadouts to give useful feedback, so the test server provides trial diamonds freely. This is deliberate: a tester who cannot unlock the new character cannot test the new character.
What you can do with them
Unlock trial characters, test weapon skins, and experiment with loadouts you would never risk diamonds on in the live game. Use the freedom aggressively in the Free Fire Beta APK; that is what the resources are for.
What resets
Everything. Test diamonds, unlocks, and stats wipe when the cycle ends, and nothing transfers to your main account. Anyone promising to convert beta diamonds to real ones is running a scam. Enjoy the sandbox while it lasts, and grab the current build from the Free Fire Beta download page. The redeem codes guide covers the other way testers get freebies.
Spending strategy on the test server
Since everything resets, the optimal strategy is to spend everything. Unlock every trial character, test every loadout, and burn diamonds on experiments you would never try on the live game. Hoarding trial currency is the only way to waste it.
What carries over: knowledge
The one thing that survives the reset is what you learned: which characters fit your style, which weapons suit your aim, which rotations work. Treat the test server as a classroom with free tuition, and the reset as graduation.