Heart and Diamond faces are among the pairs most commonly confused with each other, usually because one or two measurements land close together even though the overall proportions differ.
Heart Face Shape
Heart: Forehead and cheekbones are noticeably wider than the jaw; chin comes to a visible point. A heart-shaped face widens at the forehead and temples, narrows through the cheekbones, and tapers to a pointed or narrow chin — the inverse proportion of a triangle shape. Many heart faces also have a slight widow's peak, which reinforces the forehead's visual width.
Diamond Face Shape
Diamond: 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.
The Key Difference
The key difference: A heart face has a jaw that "tapers inward significantly compared to the forehead," while a diamond face's jaw "narrow, tapering to match the forehead's width." That single measurement — jaw width relative to forehead and cheekbones — is usually the fastest way to tell the two apart when they're otherwise close.
Why It Matters for Styling
Why it matters for styling: Heart faces are best served by balance the forehead-to-chin taper by adding volume or width at the jawline and softening or minimizing width at the forehead and temples, which brings the upper and lower face into closer visual proportion, while diamond faces need 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 — confirming which category you actually fall into before choosing a cut, frame, or beard style matters, since the two shapes' styling advice can point in different directions.