Asscher Cut Diamonds: The Vintage Square Cut Explained

An asscher cut is a square diamond with clipped corners, cut in flat parallel planes instead of the tiny triangular facets you see on a round. That geometry gives it a deep, stepped look people call the hall of mirrors: broad flashes of white light rather than fine rainbow sparkle. Buy one for the shape and the calm, architectural look. Just go higher on clarity than you would for a round, because a step cut hides nothing.

What is an asscher cut diamond?

An asscher cut is a square step-cut diamond with cropped corners. Instead of the kite and star facets that make a round brilliant twinkle, its facets are cut as flat planes that step down toward a small square table, like a set of picture frames nested inside each other.

Cut the corners off a square and you get an eight-sided outline. That's why an asscher looks octagonal in the setting even though people describe it as square. The corners aren't decorative. They protect the most fragile points of the stone and they're the fastest way to tell an asscher from a princess cut, which keeps its sharp 90-degree points.

Two other things define the shape. The crown sits high above the girdle, and the pavilion runs deep below it. Together they give an asscher the tunneled, looking-into-a-well quality that a shallow stone can't produce.

According to GIA, the asscher's 58 facets are larger and wide-set, arranged in three rows on the top and three on the bottom, and the stone is nearly octagonal in shape. Same facet count as a round brilliant. Completely different result, because the facets are bigger and they're laid out in rows rather than radiating from the center. If you want the full map of how every outline compares, our guide to every diamond shape puts them side by side.

Why an asscher flashes instead of sparkles

A round brilliant is built to chop light into pieces. Its 57 or 58 small facets sit at angles that scatter light into fine points of white and color, which is the scintillation most people picture when they think "diamond sparkle."

A step cut does the opposite. Its facets are long, flat and parallel, so they behave like mirrors rather than prisms. Light comes in, bounces between the parallel planes, and comes back out in wide sheets. You see fewer, bigger flashes, and the effect of looking down through those stacked rows is the hall of mirrors everyone uses to describe the shape.

This is worth understanding before you shop, because it changes what a good stone looks like. On a round, a busy pattern of light covers a multitude of sins. On an asscher, you're looking through a clear window into the stone, and the pattern you see is the cut itself. A well-cut asscher shows crisp, symmetrical rows that line up around the table. A poorly cut one looks muddled, and no setting will fix it. If you want a vintage outline with brilliant faceting instead, the cushion cut gives you softened corners and full sparkle.

A 1902 cut that the 1920s made famous

Joseph Asscher developed the cut in Amsterdam in 1902. It found its audience after the First World War, when the clean geometry of the Art Deco years suited it (GIA). Squared outlines and stepped forms were the look of that decade. The asscher was already speaking the language.

The same workshop earned its name on a much bigger job. The Cullinan was the largest gem-quality rough ever found, and it had to be divided. It went to the Asscher firm in Amsterdam because of their skill with exactly that work. Joseph Asscher split the crystal along the planes where its flaws ran (GIA). One strike, no second chance.

The family came back to the design generations later. Edward Asscher, Joseph's grandson, returned to the Netherlands with a livelier version. The Royal Asscher cut carries 16 more facets than the original 58, which helps it catch light (GIA). It's patented by that house, so you can't shop for it generically. When you buy an "asscher" from most retailers, including us, you're buying the classic square step cut. If it's the Deco look that draws you rather than the cut specifically, our vintage-style settings carry the same geometry into the band.

Asscher vs emerald cut: both step cuts, different shape

This is the question we get most, and the short answer is that they're siblings. Both are step cuts with cropped corners and the same mirrored light behavior. The difference is proportion, and it changes the whole feel of the ring.

An asscher is square, with a length-to-width ratio at or very near 1.00. An emerald is a rectangle, usually somewhere around 1.30 to 1.50, so it reads long and lean and it flatters the finger by drawing the eye down it. The asscher also tends to carry a higher crown and a smaller table, which is what gives it more depth to look into and a bit more life than a comparable emerald.

Pick the asscher if you want something compact and geometric that looks deliberate rather than delicate. Pick the emerald if lengthening the finger matters to you. Neither is the safer buy, and both demand the same care on clarity. For the emerald side of the story in full, see our emerald cut guide. If a square outline is what you're after but you want maximum sparkle instead of mirrored flashes, the princess cut is the brilliant-faceted alternative.

What to look for when you buy one

Everything below follows from one fact: big open facets show you more of the stone. GIA makes the point directly in its guidance on fancy shapes, noting that larger facets reveal a diamond's color and inclusions more readily than the busy pattern of a brilliant cut (GIA). So the 4Cs don't carry equal weight here.

• Clarity first. Our consultants steer asscher buyers to VS clarity or better, and we'd rather trade a little carat weight than drop below it. An inclusion sitting under the table of a round can disappear into the sparkle. Under an asscher's table it sits there in plain view. What matters more than the grade letter is where the inclusion is, so ask for the plot and check the center of the stone. Our clarity chart walks through what each grade actually means.
• Color, one grade tighter than usual. The same wide facets that show inclusions also show body color, and warmth pools in the corners of a step cut. We'd stay in the near-colorless range, and go a grade higher if you're setting it in white gold or platinum, where any tint has a cool background to contrast against. Our color chart covers the D-to-Z scale.
• Ratio near 1.00. Anything much past 1.05 stops reading as square and starts looking like an indecisive emerald. Ask for the measurements, not just the shape name.
• Symmetry, which is where step cuts fail. Look at the corners: all four should be the same size. Look at the rows: they should run parallel and meet the table cleanly. Misalignment that would vanish on a round is obvious here. If you're choosing a stone before a setting, our guide to picking a loose lab-grown diamond covers how to read a report properly.

Why you don't see more asscher cuts

It's a fair question, and most jewelers dodge it. The honest answer has three parts, and none of them is that the shape is inferior.

First, it demands a better stone. If you need VS clarity and a tighter color grade to make the shape work, your budget buys fewer carats than it would in a round or an oval, where lower grades still look beautiful. That prices some buyers out of the shape without them ever knowing why the stones they liked cost more.

Second, it looks smaller than it weighs, which we cover below. Buyers comparing carat-for-carat across shapes tend to walk toward whatever looks biggest.

Third, taste moved. Rounds and ovals dominate the market right now, so cutters produce fewer asschers, which makes them harder to find, which reinforces the pattern. That's a supply loop, not a verdict on the cut.

If you like the shape, its rarity is the upside. You will not see your ring on three other hands at the same party, and the design has already survived a century, two revivals and every trend in between. That's a better bet than whatever is peaking this year.

How big an asscher looks, and what it costs

Say this part plainly: a 2 carat asscher looks smaller than a 2 carat round. Carat is weight, not size. A step cut puts much of that weight into a deep pavilion under the girdle, where you can't see it. So the face-up surface, the part that actually shows, comes out smaller than a brilliant of the same weight.

So don't shop by carat number alone. Ask for the millimeter measurements and compare those, or size up a little to land where you expected. Plenty of our clients buy a slightly heavier asscher for exactly this reason and are happier for it.

Here's what asscher pieces actually cost at Liori today. These are live prices for lab-grown center stones, not estimates.

Choosing a lab-grown center stone is what makes the higher clarity and color grades an asscher wants affordable at these weights. The cost-per-carat ladder breaks down how that math works across sizes.

Settings that suit an asscher

The shape is strong enough to carry a plain setting, which is why so many asschers end up as solitaires. A four-prong solitaire that grips the cropped corners is the purest version, and it leaves the stepped table completely open.

A halo is the practical choice if you want more presence on the hand. It answers the face-up size issue directly by adding visual width, and a micropavé halo keeps the frame fine enough that it doesn't fight the center stone.

Three stone is where the asscher does something no other shape quite matches. Set it with trapezoid side stones and the flat edges meet exactly, giving you one continuous stepped band of light instead of three separate stones. Our piece on what a three-stone ring means covers the symbolism if that matters to you.

A bezel suits it too, especially if you work with your hands, since the metal rim shields the corners. For a fuller comparison of how these settings behave day to day, see halo vs solitaire vs three stone. On metal, white gold and platinum both give the cool background that keeps a step cut looking crisp, and our white gold vs platinum guide covers the trade-offs.

Frequently Asked Questions (FAQ)

The questions we get asked most about asscher cuts. If yours isn't here, ask one of our diamond consultants.

What is special about asscher cut diamonds?

The stepped facets. An asscher is cut in flat parallel planes rather than the small triangular facets of a brilliant, so it reflects light in broad flashes and gives you that layered, looking-down-a-well effect. Add the square outline and cropped corners and you get a shape that reads architectural rather than sparkly. It's also the rarer choice, since rounds and ovals dominate the market.

What's the difference between an asscher and an emerald cut?

Shape and proportion. Both are step cuts with cropped corners, but an asscher is square with a length-to-width ratio near 1.00, while an emerald is a rectangle around 1.30 to 1.50. The asscher usually carries a higher crown and smaller table, so it has more depth to look into; the emerald is flatter and more open, and it elongates the finger. Our guide to emerald cuts covers that shape in full.

What clarity do you need for an asscher cut?

We'd stay at VS or better. The wide, open facets of a step cut show inclusions that a brilliant's busy pattern would hide, and GIA notes that larger facets reveal a diamond's color and inclusions more readily. Position matters as much as the grade, so check the plot for anything sitting under the center of the table. The clarity chart explains each grade.

Do asscher cut diamonds look smaller than round diamonds?

Yes, at the same carat weight. A step cut carries more of its mass in a deep pavilion below the girdle, so less of the weight shows face-up. Compare millimeter measurements rather than carat numbers, and consider sizing up slightly or choosing a halo to add visual width. Our loose stone guide covers reading measurements off a report.

Are asscher cut diamonds more expensive?

The cut itself doesn't carry a premium, but a good one often costs more in practice, because the shape needs higher clarity and color grades to look its best. At Liori, asscher pieces currently run from $2,999 for a 1.5 carat lab-grown halo up to $49,999 for a 17 carat three stone. Choosing a lab-grown center stone is what keeps the grades an asscher wants within reach, as the price ladder shows.

What setting looks best with an asscher cut?

A four-prong solitaire is the purest, a halo adds the visual size a step cut gives up, and a three stone with trapezoid sides creates one continuous band of stepped light. A bezel is the most protective if you're hard on your hands. Whichever you pick, a cool metal keeps the stone crisp, so see how the main settings compare.