A diamond face is defined by a specific set of proportions: Cheekbones are the clear widest point; forehead and jaw are both notably narrower and close in width to each other. A diamond face narrows at both the forehead and the jaw while flaring dramatically at the cheekbones — the opposite structure of a rectangle. The chin is often pointed, and the temples can appear slightly recessed relative to the cheekbone's width. That geometry is exactly why the long bob (lob) performs as well as it does on this shape — the cut isn't a generic flattering choice, it's a structural match.
Why This Cut Works for Your Face Shape
Why it suits a diamond face: Soften and add visual width at the forehead and jaw to bring them closer to the cheekbone's width, while avoiding extra volume directly at cheekbone height, which is already the face's widest point. The long bob (lob)'s placement of volume — below the jaw, at collarbone height — directly serves that goal. Length that extends past the jaw and chin, adding vertical space below the face, and jaw emphasis, since the cut line sits well below it rather than at it. On a diamond face specifically, whose forehead reads as "narrow, often the narrowest of the three width measurements" and whose jaw reads as "narrow, tapering to match the forehead's width," this combination brings the upper and lower face into proportion rather than exaggerating whichever measurement is already largest.
The Mechanics of the Cut
How the long bob (lob) is actually cut: A bob cut at or just below collarbone length rather than jaw length, with light layering at the ends, longer than a classic bob but shorter than shoulder-length long hair. Volume in this style sits at the below the jaw, at collarbone height. Trim every 6-8 weeks
Confirm You Have a Diamond Face
Confirming you actually have a diamond face first: Measure forehead, cheekbone, and jaw width. On a diamond face, cheekbone width clearly exceeds both forehead and jaw width, while forehead and jaw measurements land close to each other — a silhouette that's genuinely narrow at both ends and wide in the middle.
What to Avoid Instead
What to avoid instead: For a diamond face, steer clear of slicked-back styles with no fringe that leave the narrow forehead fully exposed, and frames sitting exactly at cheekbone width, which visually extends the widest point instead of balancing it. A long bob (lob) sidesteps that risk entirely because a bob cut at or just below collarbone length rather than jaw length, with light layering at the ends, longer than a classic bob but shorter than shoulder-length long hair.
Getting It Right
Getting it right at the barber or salon: Bring a clear photo reference, and specifically ask for volume concentrated at the below the jaw, at collarbone height — that's the detail that makes this cut work for a diamond face rather than just looking good on a model with different proportions. Trim every 6-8 weeks Between appointments, use a light styling product rather than a heavy one; on a diamond face, over-styling volume in the wrong zone can undo the proportional balance this cut is built to create.