A diamond face is widest at the cheekbones and narrow at both the forehead and the jaw. Glasses sit just above the cheekbones, which makes them the easiest way to widen the brow line and take the emphasis off the middle. Top-heavy frames, soft edges at the cheek. Here is what that means in frames, for women and for men.
What makes a face diamond, and why it matters for glasses
Face length divided by cheekbone width sits around 1.50. Jaw width over cheekbone width is about 0.76, and forehead width over cheekbone width about 0.80, both well below oval's 0.80 and 0.88. The cheekbones are clearly the widest point, and the outline narrows above and below them.
Glasses sit in the narrow zone just above the cheekbones, which is why they are so useful for this shape. A frame that is wide and defined at its top edge draws a line across the forehead at nearly cheekbone width, and the face reads as balanced from brow to cheek instead of tapering to a point. A frame that is narrow, or that puts its weight low at the cheek, does the opposite: the cheekbones become the widest thing in the picture, with a small frame sitting inside them.
Diamond is often confused with heart, which has the same narrow jaw but a wide forehead; the glasses advice for heart is close to the reverse of this page. The face shape tool measures the forehead ratio that separates them.
The one principle
Width at the brow, softness at the cheek. Browlines, cat-eyes and top-detailed frames put the width where the forehead is narrow. Oval and rounded lower edges keep the frame from adding a hard line at the cheekbone. Frame width should match the cheekbones or sit just inside them: wide enough that the face does not look wider than the glasses, not so wide that the frame adds to the widest point.
Frame shapes at a glance
Frame
What it is
What it fixes
Browline
Heavy top bar, thin or rimless below
The best single answer: widens the narrow upper face, stays quiet at the cheekbone
Cat-eye
Upswept outer corner
Lifts the line above the cheekbones and adds width at the temples. The one face where cat-eye has a structural job
Oval
Wider than deep, no corners
Width across the eyes with no hard line to catch on the cheekbone
Rimless, detailed top
No rim, but a visible bar or bridge
Nothing at the cheek, interest at the brow. Especially good on men
Rounded rectangle, worn high
Soft rectangle, top edge at the brow
A horizontal at the top of the face; keep depth moderate so it clears the cheekbone
Round, moderate size
Sits above the cheekbone, heavier top rim
Softens everything — so pick a size that stops short of the cheekbone
Decorative temples
Contrasting colour, visible hinge, wide arm
Width at the sides of the upper face, which is exactly where this shape is narrow
Aviator, straight top bar
Navigator style, defined bar on top
Width at the brow while the lens still narrows downward. Better here than the teardrop
Frame shapes that work
Browline (clubmaster)
The best single answer. A heavy top bar draws a strong horizontal line at the brow, widening the narrow top of the face, while the thin or rimless bottom stays quiet at the cheekbone. Works for women and men alike.
Cat-eye
For women, the upswept outer corner lifts the frame's line above the cheekbones and adds width at the temples. Soft or sharp both work on this shape; it is the one face where a cat-eye has a structural job as well as a stylistic one.
Oval
Wider than deep, with no corners to catch on the cheekbone. Oval frames add width across the eyes without adding a hard line below them. A safe, versatile choice.
Rimless with a detailed top
Rimless frames add nothing at the cheek, and a version with a visible top bar, a decorative bridge or distinctive temples adds interest at the brow. Especially good on men.
Rounded rectangle, worn high
A soft rectangle whose top edge sits at the brow adds a horizontal line at the top of the face. Keep the lower corners rounded and the depth moderate so the bottom of the frame stays above the cheekbone.
Round, moderate size
Round frames soften everything, including the cheekbones. Choose a size that sits above the cheekbone rather than over it, and a slightly heavier top rim if the frame offers one.
Frames with decorative temples
Detail at the temple adds width at the sides of the upper face, which is exactly where a diamond face is narrow. Look for contrasting colours, visible hinges or wider temple arms.
Aviator with a straight top bar
The navigator-style aviator, with a defined straight bar across the top, adds width at the brow. The lens still narrows toward the bottom, keeping the cheekbone quiet. Better than the fully rounded teardrop on this shape.
Where to try these shapes
Both stores ship within the US and let you filter frames by shape, so you can go straight to the styles recommended above.
Amazon.The widest range of frames at every price, with reviews and free returns on most listings. Start from the shapes recommended above and filter by frame shape. Search frames on Amazon →
Disclosure: links in this box are affiliate links. If you buy through them we may earn a commission at no extra cost to you. As an Amazon Associate, faceanalyzer.org earns from qualifying purchases. It does not change which shapes we recommend.
Size, bridge and fit
Width: match the cheekbones or sit just inside them. Narrower makes the cheekbones look wider; much wider adds to the widest point.
Top edge: the part of the frame to give presence: a bar, a colour, a shape. Worn at or just below the brow.
Lower edge: keep it soft and above the cheekbone. Rounded corners, thin rim, or no rim.
Depth: moderate. A deep frame reaches down over the cheekbone and puts a line across the widest point.
Bridge: a slightly high or decorative bridge adds interest at the top centre. Avoid low bridges that drop the frame onto the cheeks.
Temples: wider or decorative temples add width at the temples of the face, which is a direct fix.
Sunglasses for a diamond face shape
Sunglasses are larger and usually sit lower, so watch the depth: a big lens that reaches over the cheekbone adds width at the widest point. Choose shapes that are wide at the top and soft at the bottom.
Cat-eye
The best sunglass shape for this face. Upswept corners, width at the temples.
Browline / clubmaster
Heavy top bar, light bottom. Classic and correct here.
Oval
Wide, soft, no corners at the cheek.
Navigator aviator
Straight top bar, lens narrowing toward the bottom.
Round, moderate
Fine if the lens sits above the cheekbone. Avoid oversized rounds that cover it.
What to skip
Small narrow lenses, deep oversized squares that reach the cheek, and any frame with a heavy lower rim. All make the cheekbones the widest thing in view.
What to avoid, and why
Narrow frames. Make the cheekbones look wider by comparison. This is the diamond-face mistake in glasses.
Frames with a heavy lower rim at cheek level. Put a line across the widest point of the face.
Deep frames that reach over the cheekbone. Same problem with more surface area.
Hard rectangles with sharp lower corners. The corners catch on the cheekbone and the frame looks boxy inside the widest part of the face.
Frames much wider than the cheekbones. Add to the widest point instead of the narrow brow.
Very small round frames. Sit inside the cheekbones and make them look enormous.
If you are leaning toward another shape
Diamond leaning heart (forehead ratio nearer 0.9): the brow needs less width and the top bar should lighten. See the heart-face guide, which is nearly the reverse of this one.
Diamond leaning oval (ratios nearer 0.88 and 0.80): most restrictions relax. See the oval guide, keeping a light preference for top-heavy shapes.
Diamond leaning oblong (length/width above about 1.55): keep the top-heavy shapes and allow more depth; a deep browline or a tall cat-eye covers both. See the oblong guide.
Frames that add width at the brow line and stay soft at the cheeks: browlines and clubmasters, cat-eyes, oval frames, and rimless styles with a detailed top. A diamond face is widest at the cheekbones, with the forehead about 0.80 and the jaw about 0.76 of that width, so a frame that carries its weight and width at the top makes the forehead look broader and the cheekbones less like the only wide point. Oval frames work because they are wider than they are deep without adding hard lines at the cheekbone.
What glasses should a diamond face avoid?
Narrow frames, which make the cheekbones look wider by comparison, and frames that are heavy or wide exactly at cheekbone level, which add to the widest point. Very small frames and frames with a strong lower rim at the cheek are the two to walk past. Hard rectangles that hit the cheekbone also tend to look boxy on this shape.
Do cat-eye glasses suit a diamond face?
Yes, they are one of the best shapes for it. The upsweep at the outer corner lifts the line of the frame above the cheekbones and adds width at the brow, which is exactly where a diamond face is narrow. Both soft and sharp cat-eyes work; choose by taste.
What glasses suit men with a diamond face shape?
Browline and clubmaster frames, which put width and weight at the brow; rimless frames with a defined top; and oval or rounded frames in a moderate size. Searches for this shape on men are among the easiest of any face-shape query, and the advice is simple: top-heavy, not bottom-heavy. A short beard along the jaw balances the lower half and pairs well with a browline above.
How do I know if my face is diamond or heart?
Both have a narrow jaw. Diamond has a narrow forehead too, about 0.80 of the cheekbone width; heart has a wide forehead, near 0.96. Measure forehead width divided by cheekbone width, or let the tool measure it from a photo. The glasses advice is nearly opposite for the two, so it is worth checking.
Updated 2026-09-10
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Diamond, or heart with strong cheekbones?
The two shapes share a narrow jaw and differ at the forehead, and the glasses advice is nearly opposite. The scanner measures your forehead-to-cheekbone ratio from a photo and tells you which you are closest to.
Front-facing, unobstructed, evenly lit photos work best. Your photo is analysed on your phone or computer and is never uploaded.
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