

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 Weight | Size (mm) |
|---|---|
| 0.25 ct | 3.5 x 3.5 mm |
| 0.33 ct | 3.8 x 3.8 mm |
| 0.5 ct | 4.5 x 4.5 mm |
| 0.75 ct | 5.2 x 5.2 mm |
| 1 ct | 5.8 x 5.8 mm |
| 1.25 ct | 6.2 x 6.2 mm |
| 1.5 ct | 6.7 x 6.7 mm |
| 2 ct | 7.3 x 7.3 mm |
| 2.5 ct | 7.8 x 7.8 mm |
| 3 ct | 8.2 x 8.2 mm |
| 4 ct | 9.0 x 9.0 mm |
| 5 ct | 9.8 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?
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
Setting Ideas
- Halo (the most popular pairing, emphasizes the pillow shape and adds perceived size)
- Solitaire with a thin, delicate band for a clean modern look
- Three-stone with trapezoid or half-moon side stones
- Vintage-inspired with milgrain and filigree details
- Pave band. Adds continuous sparkle that complements the cushion's fire.
- Cathedral setting. Elevates the stone and creates an elegant profile.
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.