Is beauty an abstract noun?

Yes, beauty is an abstract noun.

Abstract are noun that do not have physical presence or that which you cannot touch. The face can be touched but beauty can't be touched.

Examples: Lose your anger before you lose each other. (Anonymous)

Stupidity has more story to tell than intelligence .

Was it so important that you had to forfeit your morals ?

The police, prosecutors, lawyers and judges work for justice but they are not justice .

How many deaths will it take until you know that too many people have died? (Bob Dylan's Blowing In The Wind)

Change is in the hands of the Filipinos if Duterte becomes the President.