Gothic coming of age drug memoir?

So I realize this isn’t a lot to go on, I only remember one scene. It’s in color, and I’m guessing made in the late 80’s or 90’s. I feel like it had a soundtrack akin to Lost Boys, like classic rock punk/alternative.
In the scene there’s a pretty blonde girl who looks to be 15-19 years old dressed in black staring at herself in a bathroom mirror that’s pretty dirty. Her boyfriend, or guy who wants to bang her puts a diamond choker on her and tells her something, she says that it’s beautiful and looks at herself sadly. The boy is tall skinny and brunette and has dark features, I think he is a drug dealer or pimp or something. That’s all I remember.

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