Cushion Cut Moissanite: Soft Corners, Hard Choices
Cushion cuts come in two characters that share a name: crushed ice, which shimmers in small pieces, and modified brilliant, which throws large distinct flashes. Decide which one you want before you compare prices.
Two cushions, not one
The cushion cut is a square or rectangular stone with rounded corners, descended from the old mine cuts of the 19th century. Modern cushions are cut in two quite different styles, and sellers rarely label which one you are looking at.
One is the crushed-ice cushion: a high facet count arranged in a tight mosaic. The other is the modified brilliant cushion, sometimes called a chunky or antique-style cushion, with fewer and larger facets. They photograph similarly. They do not look similar in person.
Crushed ice vs. modified brilliant
| Crushed ice | Modified brilliant | |
| Facet size | Small, many, irregular | Large, fewer, geometric |
| Light behavior | Continuous shimmer, like frost | Bold flashes that turn on and off |
| Hides flaws | Very well | Less well — the facets are big and readable |
| Look | Modern, dense, almost glittery | Vintage, glassy, calm |
| Best for | Small stones, pavé bands, halos | A center stone you look at closely |
Neither is better. Crushed ice is more forgiving and reads brighter at 4 mm. Modified brilliant is more interesting at 7 mm, where you can actually see the facet structure — and on moissanite, the large facets are where the double refraction becomes visible as a slight doubling along the edges, which some buyers love and others do not.
Length-to-width ratio: 1.00 to 1.20
A cushion at 1.00 is a square with soft corners. At 1.20 it is a clear rectangle. Most of the flattering range sits between 1.05 and 1.15, which is square enough to look classic and slightly long enough to lengthen the finger.
Below 1.00 the stone starts looking like a squashed circle, and the corners get so round that the cushion identity disappears. Above 1.25 you are really buying an oval with corners.
Soft corners still need protecting
Rounded does not mean safe. A cushion's corners are still the thinnest part of the girdle and the first thing to take an impact. The difference from a princess is that the corner is a curve rather than a point, so it chips less catastrophically and is easier to polish out.
Prongs should land on the four rounded corners, not the flats. On a halo, check that it follows the cushion outline — a round halo leaves corner gaps that catch on clothing.
Why cushions look bigger than they weigh
The rounded outline has no sharp geometry for the eye to measure against, so the stone reads as a soft mass rather than a defined shape. A 1-carat cushion measures roughly 6 mm across, against about 5.5 mm for a princess of the same weight.
That is a real advantage if you want presence without carat, and a disadvantage if you want crispness: a cushion's soft edge blurs into a halo in a way a square never does.
Depth is where the fire comes from
Cushions are cut deep, commonly 63 to 70 percent of their width, and that depth is not waste. It is the pavilion angle doing the work of returning light. A deep cushion with a good angle throws fire; a shallow one lets light pass straight through.
The failure mode is a stone that looks glassy and gray from directly above, then brightens when you tilt it. That is a window — you are seeing through the pavilion to the setting or your finger. Ask for the depth percentage and a straight-on photo; if the center is transparent rather than reflective, walk away.
Judging crushed ice from a video
Photos are useless here: a still of a crushed-ice stone and a still of a brilliant one can look identical. Video works, if it is shot the right way.
- Insist on natural light. Ring lights and light boxes flatten everything into sparkle. A window and a gray day are the honest test.
- Look for the rotation. A crushed-ice stone shimmers continuously as it turns, with no clear moment where the pattern changes. A modified brilliant has distinct "on" and "off" positions as big facets catch and lose the light.
- Watch the center. If a dark spot stays fixed in the middle through the whole rotation, the cut is too deep or the pavilion angle is wrong.
- Count the pattern. Pause the video and look at the facet shapes. Many small irregular polygons means crushed ice; a handful of large triangles and kites means modified brilliant.
The vintage argument
The cushion is the only popular cut that looks correct in an antique setting. A bezel with milgrain, a three-stone with tapered baguettes, a filigree gallery — all were designed around cushion proportions and look slightly off with a round brilliant dropped in.
If the design is modern and minimal, a crushed-ice cushion fits better. If you are building something that reads 1920s, buy the modified brilliant.
What we make
We cut and set cushion moissanite in our own factory in Wuzhou, operating since 2008, in both crushed-ice and modified-brilliant styles so you can compare them side by side rather than guess from a listing. Stones are D color, VVS1, GRA certified; metal is 925 silver or 9K, 14K and 18K gold.
Pieces run from $17 to $2,020, most around $98, with free shipping over $99 and 30-day returns on unworn items in original packaging. If you are unsure which face style you want, ask for a video of the specific stone — the difference is obvious in motion and invisible in a still.
