Not sure if this exists in public but here's what I managed to fix:
Search for
Code:
public void CheckCreditsTimer()
in file Habbo.cs located in /HabboHotel/Users/Habbo.cs.
Find
Code:
this._client.SendMessage(new HabboActivityPointNotificationComposer(this._duckets, DucketUpdate));
Below this, add the following:
Code:
int diamondAmount = 1; // Change this if you'd like to
this._diamonds += diamondAmount;
this._client.SendMessage(new HabboActivityPointNotificationComposer(this._diamonds, diamondAmount, 5));
Compile and you're good to go