Hair color placement — not the shade itself — is one of the more underused tools for adjusting how a diamond face reads. 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. Strategic highlight and lowlight placement can shift attention toward or away from specific measurements without touching a single strand's length.
The Placement Logic
The placement logic: 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. Lighter pieces draw the eye toward wherever they're placed, so on a diamond face, lighter money pieces or face-framing highlights work best positioned to reinforce that goal — near the jaw if the jaw needs more visual weight, near the temples if the forehead needs softening, and so on. Darker lowlights have the opposite effect, receding whatever they're placed against.
Applied to This Shape
Applied to this shape specifically: This face's forehead reads as "narrow, often the narrowest of the three width measurements" and its jaw as "narrow, tapering to match the forehead's width." A colorist working from that description alone — without ever seeing a generic 'flattering colors' list — can place tone correctly for this exact shape.
What to Avoid
What to avoid: 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. The same caution applies to color as to cut: heavy, uniform brightness concentrated in the wrong zone reinforces an imbalance instead of correcting it.