4.2 Carat Cushion Lab Grown Diamond Prices Comparison
As of May 2026, 4.2 carat cushion lab grown diamonds usually range from $724 to $44,413, with an average price of $5,438.In the last month, prices for these diamonds are down 9.6%.Compare 138 verified listings across 7 retailers tracked by CaratRadar.
4.2 Carat Cushion Lab Grown Diamond Market Overview
CaratRadar currently tracks 138 verified 4.2-carat cushion lab grown diamonds listed across 7 online retailers. Prices in this segment range from $724 to $44,412, with an average asking price of $5,438 and a median of $4,030.
The price spread of $43,688 (98.4% 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.
138 diamonds tracked in this segment
Price range: $724 to $44,412
Average price: $5,438
Median price: $4,030
Available across 7 retailers
Savings potential: up to 98.4%
Price Range Overview
As of May 29, 2026Real market range for this carat, shape, and diamond type.
138
$724
$5,438
$4,030
$44,413
Price History
Price Comparison Matrix
Live Listings
See all listingsCompare current retailer offers for this exact segment and open any listing for full details.
Save 65.5%IGI | 4.25ct | Cushion | G | VVS2 | Very Good
From $761
Compare at $2,206
Save 78%IGI | 4.22ct | Cushion | H | VS1 | Excellent
From $817
Compare at $3,710
Save 62%IGI | 4.29ct | Cushion | F | VS1 | Very Good
From $831
Compare at $2,189
Save 59.6%IGI | 4.22ct | Cushion | G | SI1 | Excellent
From $845
Compare at $2,092
Save 63%IGI | 4.21ct | Cushion | E | VS1 | Very Good
From $866
Compare at $2,340
Save 61.6%IGI | 4.21ct | Cushion | E | VS1 | Very Good
From $902
Compare at $2,346
Save 77.2%IGI | 4.25ct | Cushion | F | VS1 | Ideal
From $915
Compare at $4,018
Save 61.4%IGI | 4.28ct | Cushion | E | VS1 | Very Good
From $935
Compare at $2,425
Save 62.2%IGI | 4.26ct | Cushion | E | VVS2 | Very Good
From $958
Compare at $2,537
Save 77.7%IGI | 4.23ct | Cushion | E | VS1 | Ideal
From $983
Compare at $4,409
Save 60.4%IGI | 4.23ct | Cushion | E | VVS2 | Very Good
From $997
Compare at $2,515
Save 13.3%IGI | 4.21ct | Cushion | G | VVS2 | Very Good
From $1,015
Compare at $1,171
Save 56.2%IGI | 4.26ct | Cushion | F | VVS2 | Very Good
From $1,025
Compare at $2,341
Save 53.1%IGI | 4.25ct | Cushion | F | VS1 | Ideal
From $1,030
Compare at $2,195
Save 13.3%IGI | 4.23ct | Cushion | F | VS2 | Good
From $1,030
Compare at $1,188
Save 72.4%IGI | 4.22ct | Cushion | FANCY | VS1 | Very Good
From $1,037
Compare at $3,754
Save 56.4%IGI | 4.21ct | Cushion | E | VS1 | Ideal
From $1,038
Compare at $2,380
Save 13.4%IGI | 4.21ct | Cushion | E | VS1 | Very Good
From $1,044
Compare at $1,205
Save 59.5%IGI | 4.28ct | Cushion | E | VVS2 | Very Good
From $1,048
Compare at $2,587
Save 56.3%IGI | 4.23ct | Cushion | E | VS1 | Very Good
From $1,054
Compare at $2,410
Save 57%IGI | 4.28ct | Cushion | E | VS1 | Very Good
From $1,055
Compare at $2,454
Save 55.5%IGI | 4.23ct | Cushion | E | VS1 | Excellent
From $1,074
Compare at $2,415
Save 53.2%IGI | 4.24ct | Cushion | F | VVS2 | Very Good
From $1,091
Compare at $2,333
Save 53.5%IGI | 4.28ct | Cushion | F | VVS2 | Ideal
From $1,112
Compare at $2,389
Save 16%IGI | 4.25ct | Cushion | E | VVS2 | Excellent
From $1,112
Compare at $1,324
Save 46.6%IGI | 4.21ct | Cushion | F | VS1 | Very Good
From $1,125
Compare at $2,107
Save 47%IGI | 4.22ct | Cushion | F | VS1 | Very Good
From $1,129
Compare at $2,130
Save 55.1%IGI | 4.21ct | Cushion | E | VVS2 | Very Good
From $1,137
Compare at $2,533
Save 55.2%IGI | 4.22ct | Cushion | E | VVS2 | Very Good
From $1,140
Compare at $2,545
Save 55.3%IGI | 4.23ct | Cushion | E | VVS2 | Very Good
From $1,142
Compare at $2,556
Save 55.3%IGI | 4.23ct | Cushion | E | VVS2 | Very Good
From $1,142
Compare at $2,556
Save 55.3%IGI | 4.23ct | Cushion | E | VVS2 | Very Good
From $1,142
Compare at $2,556
Save 55.5%IGI | 4.25ct | Cushion | E | VVS2 | Very Good
From $1,148
Compare at $2,578
Save 55.8%IGI | 4.29ct | Cushion | E | VVS2 | Very Good
From $1,159
Compare at $2,624
Save 55.8%IGI | 4.29ct | Cushion | E | VVS2 | Very Good
From $1,159
Compare at $2,624
Save 14.6%IGI | 4.29ct | Cushion | E | VVS2 | Excellent
From $1,159
Compare at $1,357
Save 49.8%IGI | 4.26ct | Cushion | F | VVS2 | Very Good
From $1,169
Compare at $2,327
Save 62.7%IGI | 4.21ct | Cushion | F | VS1 | Very Good
From $1,177
Compare at $3,155
Save 63.3%IGI | 4.25ct | Cushion | D | VVS2 | Excellent
From $1,184
Compare at $3,230
Save 45.5%IGI | 4.22ct | Cushion | E | VS2 | Very Good
From $1,194
Compare at $2,191
Save 46.8%IGI | 4.28ct | Cushion | E | VS2 | Very Good
From $1,194
Compare at $2,246
Save 45.9%IGI | 4.29ct | Cushion | G | VS1 | Ideal
From $1,196
Compare at $2,211
Save 77.6%IGI | 4.25ct | Cushion | H | VS2 | Ideal
From $1,202
Compare at $5,360
Save 56.4%IGI | 4.26ct | Cushion | D | VS1 | Ideal
From $1,225
Compare at $2,808
Save 78.2%IGI | 4.24ct | Cushion | E | VVS2 | Ideal
From $1,288
Compare at $5,920
Save 25.7%IGI | 4.21ct | Cushion | D | VVS2 | Very Good
From $1,311
Compare at $1,765
Save 75.3%IGI | 4.22ct | Cushion | D | VVS2 | Ideal
From $1,314
Compare at $5,315
Save 43.9%IGI | 4.29ct | Cushion | F | VVS2 | Very Good
From $1,320
Compare at $2,351
Save 71%IGI | 4.25ct | Cushion | D | VVS2 | Excellent
From $1,340
Compare at $4,625
Save 72.9%IGI | 4.24ct | Cushion | FANCY | VS2 | Very Good
From $1,349
Compare at $4,972
Entry pricing in this category starts around $724.
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 $43,688 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 $4,030 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 138 comparable stones in this segment. Prices start around $724 and go up to $44,412.
Based on the latest market data, the average asking price is about $5,438 with a median around $4,030.
The observed spread is roughly $43,688 across tracked listings, which is about 98.4% from highest to lowest offer in this bucket.
We refresh pricing data daily so these pages stay current with market changes.
Based on completed market data, the fair market benchmark is $5,438. The median price is $4,030, so offers between the median and fair benchmark can be reasonable, while reputable listings below the median may be especially competitive.
We currently track this stone category across 7 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 $43,688 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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