Cushion, Radiant and Asscher Cuts Explained

A cushion, a radiant and an asscher are all square or rectangular in outline, and in a small photograph they can look almost interchangeable. They behave nothing alike. A cushion and a radiant are brilliant cuts, built to sparkle and forgiving of inclusions. An asscher is a step cut, built for calm parallel reflections, and it displays every inclusion under its large flat facets. The difference is visible the moment the stone is set, and it changes both the clarity grade you need and the price you pay for it.

What each of the three actually is

Two brilliant cuts and one step cut, sharing an outline but not a facet structure.

A cushion cut is a square or rectangular stone with rounded corners and a brilliant-style facet pattern, refined over generations into several variants from chunky to crushed-ice in appearance. A radiant cut is a square or rectangular brilliant with cut corners, developed specifically to combine a square outline with the light return of a round. An asscher is a square step cut with cut corners, related to the emerald cut and producing wide parallel reflections.

The shared feature is the clipped corner, which removes the sharp angles that make a princess cut vulnerable and makes all three easier to set safely.

The three compared

Light behaviour, outline and what each does with clarity.

Property	Cushion	Radiant	Asscher
Cut family	Brilliant	Brilliant	Step
Outline	Rounded corners, soft square	Clipped corners, square or rectangular	Clipped corners, square
Appearance	Soft, pillowy sparkle	Bright, lively, high contrast	Calm, architectural, hall of mirrors
Handles inclusions	Very forgiving	Forgiving	Shows them clearly
Handles body colour	Good	Good	Shows it
Clarity grade to aim for	Lower grade can look clean	Lower grade can look clean	Higher grade needed

Cushion cut

The softest of the three in appearance and the most forgiving on clarity.

A cushion’s rounded corners and its many facets break up the interior of the stone, so inclusions are difficult to see and a moderate clarity grade frequently looks clean. The outline also makes the stone appear slightly wider than a square of the same weight, which is part of its appeal. The variation within the category is the thing to watch: cushion cuts range from a chunky, broad-facet look to a crushed-ice appearance with many small reflections, and the two feel quite different on the hand.

Because the look varies so much, a buyer choosing a cushion should compare several stones rather than choosing from a grade and a weight.

Radiant cut

A square outline with the light behaviour of a brilliant cut.

The radiant was developed to combine the geometry of a square with the scintillation of a round, and it succeeds at that: the clipped corners allow a facet arrangement that returns light brightly, and the stone reads as lively rather than as calm. It hides inclusions well and tolerates a slightly lower colour grade than a step cut, because the facet pattern breaks up the interior view.

In a band, the radiant is one of the easier square shapes to work with because its cut corners leave metal at the edges of each setting. That makes it a common choice for channel-set bands and eternity rings.

Asscher cut

The most architectural of the three and the most demanding on clarity.

A square step cut with clipped corners, the asscher produces broad parallel reflections that read as depth rather than sparkle. Under its large flat facets, inclusions are visible in a way they never are in a brilliant cut, which means a higher clarity grade is usually needed to achieve the same clean appearance. The same applies to body colour: a step cut shows warmth that a brilliant cut would conceal.

The compensation is that an asscher is a design statement. It reads as older, calmer and more formal than a brilliant cut, and it suits a restrained setting that lets the outline do the work — commonly a bezel or a simple four-corner setting.

How to compare them fairly

The comparison changes once clarity is priced in.

At the same carat weight and grades, the three sit in a similar range. The shift comes when the clarity the cut actually needs is factored in: an asscher that must be set with a higher clarity grade to look clean can end up costing more than a cushion of the same size that looks clean at a lower grade. The honest comparison is face-up size at a clarity that looks clean in that specific cut, not carat weight at a fixed grade.

That logic is the same one applied across all shapes in the shape comparison, where spread and light behaviour are weighed against price.

Settings for each

The outline suggests the mounting, and the cut family suggests the height.

A cushion works in almost any setting, including a halo, because its soft outline reads well surrounded by small stones. A radiant suits a four-corner prong setting that covers the clipped corners, or a channel when used in a band. An asscher suits a bezel or a bar setting that keeps the lines straight and does not compete with the stone’s reflection pattern.

In all three cases the corners, though clipped, remain the thinnest part of the stone, so prongs or bezel edges should cover them rather than grip the sides.

What to check on the report

Four items, weighted differently for each cut.

For all three: measurements and length-to-width ratio, which describe the outline. For a cushion, the ratio matters most, since the difference between a square and a distinctly rectangular cushion changes the look. For a radiant, check symmetry, because misaligned facet rows are visible in a square outline. For an asscher, check clarity and colour carefully and look at where the inclusions sit relative to the large table facet, since placement matters more than the grade here.

Most fancy shapes do not receive a cut grade, so proportion and outline remain the buyer’s assessment.

Sources and further reading

• GIA 4Cs — cut and light performance across styles
• GIA Gem Encyclopedia — cushion, radiant and step cut styles
• GIA — grading scales and fancy shape reporting
• International Gemological Institute — grading and reports
• CIBJO Blue Books — cut terminology
• International Gem Society — cutting style reference

Next step: Tell us the outline you prefer and the clarity grade you were considering, and we will show what each of the three cuts looks like at that grade so the comparison is made on appearance rather than on paper. Loose stones, bands and finished pieces are all supplied OEM/ODM. Contact vinico@zkzdiamonds.com or WhatsApp +86 135 3037 8229.

{“@context”:”https://schema.org”,”@type”:”FAQPage”,”mainEntity”:[{“@type”:”Question”,”name”:”Cushion or radiant cut?”,”acceptedAnswer”:{“@type”:”Answer”,”text”:”A cushion has a softer, pillowy look with rounded corners; a radiant is brighter with more contrast and cut corners. Both are brilliant cuts and both are forgiving on clarity. The choice is largely about the outline: cushions vary widely from chunky to crushed-ice, while radiants are more consistent.”}},{“@type”:”Question”,”name”:”What is an asscher cut?”,”acceptedAnswer”:{“@type”:”Answer”,”text”:”A square step cut with clipped corners, related to the emerald cut. It produces broad parallel reflections rather than sparkle, and its large flat facets make inclusions and body colour visible, so it usually needs a higher clarity grade than a brilliant cut to look clean.”}},{“@type”:”Question”,”name”:”Which cut hides inclusions best?”,”acceptedAnswer”:{“@type”:”Answer”,”text”:”Cushion and radiant, because their many facets break up the interior view. Step cuts such as the asscher and emerald show inclusions clearly under their large flat facets. That is why a cushion or radiant can look clean at a lower clarity grade while an asscher of the same grade may not.”}},{“@type”:”Question”,”name”:”Do these shapes need a special setting?”,”acceptedAnswer”:{“@type”:”Answer”,”text”:”Not a special one, but one that covers the corners. All three have clipped corners rather than sharp points, which makes them easier to set safely than a princess cut, but the corners are still the thinnest part of the stone and should be covered by prongs or a bezel edge rather than gripped at the sides.”}}]}

Part of our lab grown diamonds guide.