I’m sure I’m not alone in the opinion that if the gem sale was available all festival and not just once per price point, I would have spent a lot more this festival.
@Devs, any chance you may consider reopening the sale for the duration of the anniversary? Or at least let us buy two of each pack?
I agree with this. I would definitely buy another 300 gems is that was the case.
I agree and it doesn’t would hurt the Devs 
Agree 100%
Well if you look at the top of the screen the place you buy gems it say “When purchasing a special gem deal, the confirmation popup will show the default amount of gems, but YOU WILL STILL GET THE EXTRA GEMS AFTER THE PURCHASE”.
So I guess that means you can buy as many 300gem packs as you want?
No. On iOS you get a bill for everything you buy - doesn’t matter if it is a In-App buy or a game or something like that… and the text means, that you get only 1 bill for (example) 150 Gems, one you open the game there stands 300 gems. So 150 +150 extra.
But it can only be used once in this gem-sale per 150, 1 and so on
I hope I could help you 
And if you had buy 150 gems in that sale time, you get the first time :
150+ 150 extra =300
Next 150 are normal = 150
That is with every pack
I understand. But since we have already released the news for gems sale, we cannot just add another one on top of this.
We will make sure release special sales more often during festival.
Thank you for understanding.