Short phrase clips like this circulate on soundboards because they work without any setup, and diamonds are the girls is shared mainly as a reusable glam joke. Creators lift the line for TikTok style edits, short form memes, and reaction posts where a touch of sparkle or sass is the whole point. Its appeal comes from the slightly mangled wording, which makes it more memorable and quotable than a straight delivery would be. That keeps it in rotation for beauty, fashion, and luxury themed posts even without a clear single source.