Make my Professor a gift I just received my diploma from my university. I'm very happy and my results aren't that bad either. Now, as the result is already known, I would like to thank my professor and my supervisor for their support.

Would it be acceptable, if I make them a gift to express my thankfulness?
I was thinking of a bottle of a good liquor for both of them.
The safest way to express your gratitude is to (hand)write a thank-you-card. In all likelihood that will be appreciated just as much as a gift, and is guaranteed not to cause any trouble.