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Cushion cut diamond

Cushion Diamond

The cushion cut features soft, rounded corners with a square or rectangular outline, resembling a pillow. It blends vintage charm with modern brilliance, offering exceptional fire and a distinctive chunky sparkle pattern.

Is a cushion diamond a good choice?

Cushion diamonds are known for very high brilliance with 58 facets. They're popular for engagement rings and halo settings. Here are the trade-offs.

Why people love it

  • +Exceptional fire, often displaying more colorful light dispersion than rounds
  • +25-35% more affordable than comparable round brilliants
  • +Soft, rounded corners reduce the risk of chipping
  • +Versatile aesthetic that bridges vintage and modern design
  • +Available in both square and elongated proportions to suit different tastes

Things to know

  • −Shows color more readily than rounds, so you may need a higher color grade
  • −Appears slightly smaller face-up than a round of equal carat weight
  • −No standardized cut grade from labs. You need photos or video to judge quality.
  • −The crushed ice vs. chunky distinction can be confusing when shopping

How big is a cushion diamond? (MM to carat)

A 1-carat cushion diamond measures approximately 5.8 x 5.8 mm. Here are the most common sizes from 0.25 ct to 5 ct.

Carat WeightSize (mm)
0.25 ct3.5 x 3.5 mm
0.33 ct3.8 x 3.8 mm
0.5 ct4.5 x 4.5 mm
0.75 ct5.2 x 5.2 mm
1 ct5.8 x 5.8 mm
1.25 ct6.2 x 6.2 mm
1.5 ct6.7 x 6.7 mm
2 ct7.3 x 7.3 mm
2.5 ct7.8 x 7.8 mm
3 ct8.2 x 8.2 mm
4 ct9.0 x 9.0 mm
5 ct9.8 x 9.8 mm

View full cushion size chart → with all sizes from melee to 5+ carats.

How to buy a cushion diamond

  • •Decide between chunky and crushed ice sparkle patterns before shopping. They're fundamentally different looks.
  • •Color shows more in cushions than rounds. Stay at H or above in white metal settings.
  • •For square cushions, look for L/W ratios between 1.00 and 1.05; for elongated, 1.15-1.25
  • •Check the depth percentage: stones over 68% depth will look smaller face-up than their carat weight suggests
  • •VS2 clarity is typically eye-clean in cushions due to the facet pattern breaking up inclusions
  • •Request video to evaluate the sparkle pattern. Photos alone can't convey the difference between chunky and crushed ice.

What makes a cushion diamond unique?

The cushion cut has roots dating back over 200 years, making it one of the oldest diamond shapes still in widespread use. Originally known as the 'old mine cut,' the modern cushion has been re-engineered with updated faceting patterns that dramatically improve light performance while retaining the romantic, soft-edged aesthetic that defined antique diamonds. There are two main types of cushion cuts that buyers should understand. The 'chunky' or 'crushed ice' distinction refers to the facet pattern visible when viewing the stone face-up. Chunky cushions display broad, distinct flashes of light similar to a round brilliant, while crushed ice cushions show a more scattered, almost glittery sparkle pattern. Neither is objectively better (it's a matter of personal preference), but buyers should know which type they're getting before purchasing. From a trade perspective, cushion cuts are among the most efficient shapes to cut from rough, retaining 60-65% of the original crystal weight compared to just 40-50% for round brilliants. This efficiency, combined with lower consumer demand relative to rounds, means cushion cuts typically price 25-35% below comparable round brilliants. The cushion's deep pavilion does mean it carries more weight below the girdle, so a 1-carat cushion will appear slightly smaller face-up than a 1-carat round. This is something jewelers should communicate to clients upfront.

How much does a cushion diamond cost?

Cushion diamonds are priced at 25-35% less than round brilliant. Price depends on carat weight, color, clarity, and cut quality. For a personalized estimate, use our diamond price estimator.

Estimate cushion diamond price →

Technical Specifications

Facets
58
Brilliance
very high
L:W Ratio
1.0:1 to 1.10:1 (square cushion) or 1.15:1 to 1.30:1 (elongated cushion)

Last updated: 2026-08-12

At a Glance

Price vs Round
25-35% less than round brilliant
Popularity
Third most popular (approximately 8-10% of engagement ring sales)
Sparkle
very high

Best For

engagement ringshalo settingsvintage-style jewelrythree-stone ringssolitaire settings

Setting Ideas

Frequently asked questions

Is a cushion cut diamond a good choice?

Yes, if you want exceptional fire and a romantic, soft-edged look. Cushion cuts display more colorful light dispersion than rounds and cost 25 to 35% less per carat. They show color more readily than rounds and face up slightly smaller at equal weight, so plan on a higher color grade in white metal settings.

How big is a 1-carat cushion cut diamond?

A 1-carat cushion cut measures approximately 5.8 x 5.8 mm for a square cushion. The deep pavilion means a 1-carat cushion will appear slightly smaller face-up than a 1-carat round of the same weight.

How much does a cushion cut diamond cost?

Cushion cuts typically cost 25 to 35% less per carat than comparable round brilliants. They retain 60 to 65% of rough crystal weight during cutting, which is one of the most efficient yields of any shape.

What is the best setting for a cushion cut diamond?

A halo is the most popular pairing for cushion cuts, emphasizing the pillow shape and adding perceived size. A solitaire with a thin band gives a clean modern look, while vintage-inspired settings with milgrain and filigree honor the cut's antique roots.

What is the difference between chunky and crushed ice cushion cut?

Both are cushion brilliants with different facet arrangements visible face-up. Chunky cushions show broad, distinct flashes of light similar to a round, while crushed ice cushions display a scattered, glittery sparkle pattern. Neither is objectively better; it comes down to personal preference, so always request video before buying.