Quote Originally Posted by radomir View Post
I'm studying the following phrase, that deals with New Year in Sweden:
"А уж на площадях, в больших дворах высокая красавица ёлка просто необходима!"
красавица / красавец I have seen just as substantive (a beautiful woman / - man), so, since высокая obviously refers to ëлка, here it seems like being красавица an adjective: "A high beautiful silver-fir is needed!"
It is like this? Thanks.
No, of course, it is not an adjective, it is a noun. You can see it easily from its ending. If it were an adjective, the ending would be -ая.
Just the noun in this case functions as an apposition Apposition - Wikipedia, the free encyclopedia.

Some more examples of appositions: красавица Оля, студентка Наташа, мой друг Андрей, профессор Иванов, красавица ёлка etc.