It's important to note that we can't adjust the appearance of certain facial proportions with a buzz cut as well as we can with longer styles, there's simply not enough hair to work with for this. However, this is a style that can work for a multitude of face shapes, so no matter your face shape - we can make it work. How we chose to balance the cut is where the differences come into play.
If you're a square face shape you should avoid aggressive contrast, go for a more graduated look. This will complement the angular features.
If you've a round face shape you'll want to steer in the opposite direction to the above, create a more angular look by having a tight skin fade - add a sharp beard that's longer through the chin to create a more angular appearance.
A diamond face shape is going to work. Full stop. The proportions of this face shape suit the buzz cut perfectly, lucky you.
The final word on this: a buzz cut is a revealing haircut there's no getting around that so it should be approached with that in mind.
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