Question about gems donation

Not long ago I opened a thread about using gems to buy donation for alliance (750 gems). Calculation is wrong for tower with daily donation of 750k. I also reported it as a bug directly to customer support, nothing happens. So it would take me some time to upgrade alliance tower and really interesting, with max level alliance tower using gems how much donation I can buy?

with max Alli tower u can donate 8m with 800gems excluding tax bonus(i didn’t remember how much tax bonus)

Thanks! Without loosing the gold, right?

Exact without using your treasure chamber gold.

About the gem cost, i remember that you have to pay 900 gems to donate 8M gold + your tax alliance bonus you can reach also 9M gold ^^

Thanks you oPelle!