Are we even sure he is d3?
He did send me his stake dashboard's screenshot showing his diamond 3 status. So I guess OP might not be lying and I even gave him the loan (not for gambling, he convinced me it would be for his vip bonus), so lets see how it goes from here. Lets be hopeful although I dont gamble on stake and dont have much idea about these big bonuses. Maybe I'll try later.
Good luck with the loan, I hope it goes well.
A diamond 4 bonus should be huge. Since it basically doubles for every level it should be around 100000$ for diamond 4 actually. Platinum 4 gave me 1600$, you can calculate up from there.
Where my doubts are, wager requirement for diamond 4 are $250,000,000 . So unless he has 99.99$ of the next level (where he still has to wager 250000$ to get these 0.01%) I have serious doubt he can do any meaningful wagering with a small loan like yours.