Tiffany box

Hi folks,
I came across a phrase "Tiffany box" when watching a movie ——'Bride War'.
I guess that phrase means the present a guy pops the question or proposes an engagement to his girlfriend. Is it correct?
If so, is it sort of like 'genericide', a linguistic phenomenon that uses a specific brand name to represent the very kind of product, like to 'xerox' for photocopying, 'kleenex' for paper tissue, 'stetson' for cowboy hat and so on?
Here comes the context:
Liv found a blue box from a wardrobe, probabley with a ring inside. She stared at the box calmly and was like:' Tiffany box'. And then Emma, her sidekick asked 'You're engaged?' Emma surprisingly shouted with a high key 'I AM ENGAGED!' and they two embraced warmly. And of course Liv's boyfrind hadn't officially proposed, but Liv thought he would do it soon.

Could you give us the context and a sentence, please.

Tiffany's is the name of a world-wide famous Jeweller's.
A Tiffany box would be a box with its name on, which would be expected to contain a jewel such as an engagement ring.

Bevj said:

Tiffany's is the name of a world-wide famous Jeweller's.
A Tiffany box would be a box with its name on, which would be expected to contain a jewel such as an engagement ring.

Has it expanded to be used as a more generic meaning, like I asked, with a meaning of engagement gift?

peter199083 said:

Has it expanded to be used as a more generic meaning, like I asked, with a meaning of engagement gift?

I wouldn't think so ... I just imagine that Emma knows Liv and her relationship status quite well and the engagement ring question was simply an obvious guess.

Tiffany box has not become genericized to my knowledge.