4.2 Carat Cushion Lab Grown Diamond Prices Comparison
As of February 2026, 4.2 carat cushion lab grown diamonds usually range from $811 to $34,840, with an average price of $4,311.In the last month, prices for these diamonds are down 1.9%.Compare 200 verified listings across 11 retailers tracked by CaratRadar.
4.2 Carat Cushion Lab Grown Diamond Market Overview
CaratRadar currently tracks 200 verified 4.2-carat cushion lab grown diamonds listed across 11 online retailers. Prices in this segment range from $811 to $34,840, with an average asking price of $4,311 and a median of $2,296.
The price spread of $34,029 (97.7% from highest to lowest) highlights why comparing identical certified diamonds across multiple retailers matters. Two identical certified diamonds can differ by hundreds or even thousands of dollars depending on the retailer.
These figures are based on our latest daily market data, matched by certification lab and certificate number across retailers, so you are comparing the exact same diamond.
200 diamonds tracked in this segment
Price range: $811 to $34,840
Average price: $4,311
Median price: $2,296
Available across 11 retailers
Savings potential: up to 97.7%
Price Range Overview
As of Feb 28, 2026Real market range for this carat, shape, and diamond type.
200
$811
$4,311
$2,296
$34,840
Price History
Price Comparison Matrix
Live Listings
See all listingsCompare current retailer offers for this exact segment and open any listing for full details.
IGISave 84.6%4.16ct | Cushion | H | VVS2 | Ideal
From $1,294
Compare at $8,410
IGISave 72.5%4.16ct | Cushion | G | VS1 | Ideal
From $4,736
Compare at $17,230
IGISave 82.7%4.16ct | Cushion | D | VVS2 | Ideal
From $1,605
Compare at $9,250
GIASave 81.8%4.16ct | Cushion | F | VS1 | Excellent
From $3,026
Compare at $16,650
GIASave 82.1%4.16ct | Cushion | D | VVS1 | Excellent
From $4,134
Compare at $23,130
IGISave 80.9%4.16ct | Cushion | F | VVS2 | Very Good
From $1,720
Compare at $9,010
IGISave 83.2%4.16ct | Cushion | E | VVS2 | Ideal
From $1,682
Compare at $10,020
GIASave 74.2%4.16ct | Cushion | D | IF | Excellent
From $16,060
Compare at $62,160
IGISave 77.1%4.16ct | Cushion | D | VVS2 | Very Good
From $2,060
Compare at $9,000
IGISave 81.3%4.16ct | Cushion | D | VS1 | Ideal
From $2,116
Compare at $11,330
IGISave 85.1%4.16ct | Cushion | D | VVS1 | Ideal
From $3,470
Compare at $23,340
IGISave 81.9%4.16ct | Cushion | D | VVS1 | Ideal
From $3,287
Compare at $18,180
IGISave 48.2%4.16ct | Cushion | FANCY | VS1 | Very Good
From $2,244
Compare at $4,330
IGISave 60.7%4.16ct | Cushion | E | VVS2 | Good
From $3,949
Compare at $10,050
IGISave 66.3%4.16ct | Cushion | F | VS1 | Excellent
From $2,309
Compare at $6,860
IGISave 84.4%4.16ct | Cushion | E | VS2 | Very Good
From $1,202
Compare at $7,720
IGISave 44.6%4.16ct | Cushion | F | VVS2 | Very Good
From $1,428
Compare at $2,575
IGISave 49.4%4.16ct | Cushion | FANCY | VVS2 | Ideal
From $1,715
Compare at $3,388
GIASave 81.9%4.16ct | Cushion | D | VVS2 | Excellent
From $3,120
Compare at $17,200
GIASave 81%4.16ct | Cushion | G | VS1 | Very Good
From $2,126
Compare at $11,210
GIASave 65.3%4.16ct | Cushion | D | VVS1 | Ideal
From $8,415
Compare at $24,250
IGISave 81.8%4.16ct | Cushion | E | VS2 | Ideal
From $1,233
Compare at $6,760
GCALSave 69.4%4.16ct | Cushion | D | FL | Ideal
From $22,129
Compare at $72,332
GIASave 83.5%4.17ct | Cushion | G | VS2 | Ideal
From $1,594
Compare at $9,640
IGISave 54.6%4.17ct | Cushion | FANCY | VVS1 | Very Good
From $3,905
Compare at $8,607
IGISave 85.7%4.17ct | Cushion | E | VS2 | Ideal
From $1,232
Compare at $8,630
IGISave 80.1%4.17ct | Cushion | D | VS1 | Ideal
From $2,048
Compare at $10,270
GIASave 68.8%4.17ct | Cushion | D | IF | Excellent
From $13,975
Compare at $44,810
GIASave 80.4%4.17ct | Cushion | E | VVS2 | Excellent
From $3,630
Compare at $18,510
GIASave 66.6%4.17ct | Cushion | E | VS2 | Ideal
From $2,377
Compare at $7,110
IGISave 82.8%4.17ct | Cushion | F | VS2 | Ideal
From $1,447
Compare at $8,430
IGISave 79.6%4.17ct | Cushion | E | VS1 | Ideal
From $1,736
Compare at $8,500
IGISave 70.8%4.17ct | Cushion | E | VS1 | Ideal
From $1,047
Compare at $3,585
GIASave 58.3%4.17ct | Cushion | G | VVS2 | Very Good
From $3,246
Compare at $7,790
IGISave 85.2%4.17ct | Cushion | E | VS1 | Ideal
From $1,453
Compare at $9,810
IGISave 73.1%4.17ct | Cushion | D | VVS1 | Excellent
From $5,666
Compare at $21,060
IGISave 80.7%4.17ct | Cushion | F | VS1 | Ideal
From $1,431
Compare at $7,430
IGISave 32.8%4.17ct | Cushion | D | VVS2 | Very Good
From $2,289
Compare at $3,406
IGISave 75.8%4.17ct | Cushion | E | VVS1 | Excellent
From $2,796
Compare at $11,570
IGISave 75.2%4.17ct | Cushion | D | IF | Ideal
From $11,620
Compare at $46,945
IGISave 48.9%4.17ct | Cushion | D | VVS2 | Very Good
From $2,578
Compare at $5,045
IGISave 83.4%4.17ct | Cushion | D | VVS2 | Ideal
From $1,698
Compare at $10,240
IGISave 66.5%4.17ct | Cushion | G | VVS2 | Excellent
From $865
Compare at $2,579
IGISave 75.2%4.17ct | Cushion | E | VVS2 | Very Good
From $2,331
Compare at $9,400
IGISave 81.5%4.17ct | Cushion | F | VS2 | Very Good
From $2,389
Compare at $12,920
GIASave 67%4.17ct | Cushion | D | VVS1 | Excellent
From $8,440
Compare at $25,540
GIASave 80.6%4.17ct | Cushion | D | IF | Ideal
From $10,480
Compare at $54,000
GIASave 71.4%4.17ct | Cushion | D | VVS1 | Excellent
From $6,780
Compare at $23,740
IGISave 50.9%4.18ct | Cushion | H | VS1 | Ideal
From $4,665
Compare at $9,500
IGISave 78.7%4.18ct | Cushion | D | VVS1 | Ideal
From $2,900
Compare at $13,590
Entry pricing in this category starts around $811.
What to Know When Shopping for 4.2 Carat Cushion Lab Grown Diamonds
- Always compare identical certified diamonds across retailers. Identical certificate numbers can have price differences of $34,029 or more.
- Focus on the 4Cs that matter most to you. Color and clarity grades drive price more than cut in many segments, but cut affects sparkle the most.
- The median price of $2,296 is a useful benchmark. If you see a deal significantly below this, verify the retailer's reputation and return policy.
- Consider eye-clean alternatives. Moving one clarity grade down (e.g., VS2 to SI1) can save 10-15% with no visible difference to the naked eye.
- Lab-grown diamonds offer excellent value. Ensure the stone comes with a GIA or IGI certificate confirming it is laboratory-grown.
- Check shipping, insurance, and return policies. The lowest sticker price is not always the best deal once you factor in total cost of purchase.
- Cushion cuts come in standard and modified brilliant varieties. Modified brilliants tend to show more fire, while standard cushions have broader facets.
Frequently Asked Questions
We currently track 200 comparable stones in this segment. Prices start around $811 and go up to $34,840.
Based on the latest market data, the average asking price is about $4,311 with a median around $2,296.
The observed spread is roughly $34,029 across tracked listings, which is about 97.7% from highest to lowest offer in this bucket.
We refresh pricing data daily so these pages stay current with market changes.
Based on our data, the median price is $2,296, which represents the midpoint of the market. Anything below this figure from a reputable retailer is a solid deal.
We currently track this stone category across 11 online retailers, giving you a broad view of the competitive landscape.
For most buyers, color differences below G are hard to detect once set in a ring. Clarity grades of VS2 and above are typically eye-clean. Prioritize cut quality for maximum brilliance, then balance color and clarity based on your budget.
Retailer pricing strategies, overhead costs, and margin targets all contribute. The exact certified diamond can differ by $34,029 across sellers, which is why direct certified-diamond comparison is essential.
We match diamonds across retailers by their certification lab and certificate number. This means the prices you see are for the exact same physical diamond, not just stones with similar specs. It is a true apples-to-apples comparison.
Diamond prices fluctuate based on supply and demand. Our data refreshes regularly so you can track trends over time. Use the price range on this page as a benchmark and compare it to historical averages when available.
Diamond Terminology
- Carat
- A unit of weight for diamonds equal to 200 milligrams. Larger carat weights are exponentially rarer, which is why prices increase non-linearly with size.
- Cut
- Refers to how well a diamond's facets interact with light. Cut quality ranges from Ideal to Poor and is the single biggest factor affecting a diamond's brilliance.
- Color
- Grades a diamond's lack of color on a scale from D (colorless) to Z (light yellow). Grades D-F are considered colorless; G-J are near-colorless and offer good value.
- Clarity
- Measures the presence of internal inclusions or surface blemishes. Grades range from Flawless (FL) to Included (I3). Most inclusions in VS2 and above are invisible to the naked eye.
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