The general styling rule for face shape is contrast: a frame that echoes your face's natural shape tends to exaggerate it, while a frame that contrasts with it creates definition. For a round face — where width and length are close to equal, with soft cheeks and a rounded jaw — that means angular frames generally read better than round or oval ones.
What tends to work
Square & rectangular
The straight top and bottom edges introduce horizontal lines a round face doesn't have on its own, adding structure without looking severe.
Geometric / angular
Hexagonal or slightly angular frames do the same job as square frames but softer — good if full square frames feel too heavy on your face.
Browline styles
A bold upper edge draws the eye upward and adds a defined brow line, which reads as more angular even on a fairly minimal frame.
Wider than your face
Frames slightly wider than the widest point of your face tend to elongate a round face rather than emphasizing its width.
What we'd steer you away from
Small round frames sitting exactly at the width of your cheekbones tend to visually round the face out further — not a rule you have to follow, but worth trying on next to a square option so you can see the difference on your own face rather than take our word for it.
Rules are a starting point, not a verdict
Every one of these guidelines has exceptions, and the only real test is standing in front of a mirror. This is exactly why we don't sell frames without a fitting — a shape that should theoretically work sometimes doesn't sit right on an individual face, and one that "shouldn't" work sometimes looks great. Bring a friend, try on more than you think you need to, and don't decide off a single frame.