Is it possible to buy gems in clash of clans with an iTunes gift card without a credit card?

Ok, i'm an average Clash Of Clans player and i want to buy some gems.

I don't have any sort of credit card or anything.

But i just wanted to be 100% sure that i can just buy a €10.00 iTunes card and buy the gems in the game and need a quick reply.

I'm on iPhone 4 iOS 7.12

Thanks

-xNexeon