3.9 Carat Cushion Lab Grown Diamond Prices Comparison
As of May 2026, 3.9 carat cushion lab grown diamonds usually range from $518 to $28,040, with an average price of $4,078.In the last month, prices for these diamonds are down 8.5%.Compare 121 verified listings across 8 retailers tracked by CaratRadar.
3.9 Carat Cushion Lab Grown Diamond Market Overview
CaratRadar currently tracks 121 verified 3.9-carat cushion lab grown diamonds listed across 8 online retailers. Prices in this segment range from $518 to $28,040, with an average asking price of $4,078 and a median of $2,977.
The price spread of $27,522 (98.2% 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.
121 diamonds tracked in this segment
Price range: $518 to $28,040
Average price: $4,078
Median price: $2,977
Available across 8 retailers
Savings potential: up to 98.2%
Price Range Overview
As of May 29, 2026Real market range for this carat, shape, and diamond type.
121
$518
$4,078
$2,977
$28,040
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 70.2%IGI | 3.91ct | Cushion | F | SI2 | Very Good
From $722
Compare at $2,422
Save 64.2%IGI | 3.96ct | Cushion | G | VS1 | Ideal
From $722
Compare at $2,014
Save 64%IGI | 3.93ct | Cushion | E | VS2 | Very Good
From $785
Compare at $2,180
Save 73%IGI | 3.97ct | Cushion | E | VS1 | Very Good
From $793
Compare at $2,932
Save 72.4%IGI | 3.98ct | Cushion | I | VS1 | Ideal
From $803
Compare at $2,910
Save 62.2%IGI | 3.92ct | Cushion | G | VVS2 | Excellent
From $824
Compare at $2,182
Save 72.4%IGI | 3.95ct | Cushion | FANCY | VS1 | Very Good
From $838
Compare at $3,034
Save 65.3%IGI | 3.9ct | Cushion | E | VVS2 | Very Good
From $872
Compare at $2,511
Save 65.2%IGI | 3.92ct | Cushion | E | VVS2 | Very Good
From $884
Compare at $2,543
Save 63%IGI | 3.93ct | Cushion | E | VS1 | Very Good
From $888
Compare at $2,401
Save 65%IGI | 3.97ct | Cushion | E | VVS2 | Very Good
From $913
Compare at $2,605
Save 79.6%IGI | 3.9ct | Cushion | G | VVS2 | Very Good
From $927
Compare at $4,540
Save 63.3%IGI | 3.9ct | Cushion | E | VVS2 | Very Good
From $932
Compare at $2,538
Save 78.7%IGI | 3.93ct | Cushion | G | VS1 | Excellent
From $935
Compare at $4,380
Save 77.5%IGI | 3.98ct | Cushion | G | VS1 | Ideal
From $941
Compare at $4,190
Save 63.7%IGI | 3.97ct | Cushion | E | VVS2 | Very Good
From $949
Compare at $2,611
Save 13.3%IGI | 3.92ct | Cushion | G | VS1 | Very Good
From $963
Compare at $1,111
Save 78.1%IGI | 3.95ct | Cushion | F | VS2 | Excellent
From $984
Compare at $4,490
Save 76%IGI | 3.92ct | Cushion | E | VVS2 | Ideal
From $997
Compare at $4,155
Save 59.6%IGI | 3.91ct | Cushion | E | VVS2 | Excellent
From $1,034
Compare at $2,561
Save 76.9%IGI | 3.9ct | Cushion | G | VS1 | Excellent
From $1,061
Compare at $4,590
Save 47.4%IGI | 3.97ct | Cushion | G | VS1 | Excellent
From $1,067
Compare at $2,029
Save 72.4%IGI | 3.99ct | Cushion | FANCY | VVS2 | Very Good
From $1,069
Compare at $3,872
Save 24%IGI | 3.92ct | Cushion | F | VVS2 | Very Good
From $1,069
Compare at $1,407
Save 14.3%IGI | 3.92ct | Cushion | E | VVS2 | Excellent
From $1,071
Compare at $1,249
Save 55.1%IGI | 3.9ct | Cushion | E | VS1 | Very Good
From $1,080
Compare at $2,408
Save 64.2%IGI | 3.92ct | Cushion | D | VVS2 | Very Good
From $1,092
Compare at $3,050
Save 74.1%IGI | 3.93ct | Cushion | F | VS2 | Excellent
From $1,094
Compare at $4,220
Save 50.6%IGI | 3.98ct | Cushion | G | VVS2 | Excellent
From $1,095
Compare at $2,218
Save 73.9%IGI | 3.99ct | Cushion | G | VS1 | Excellent
From $1,097
Compare at $4,200
IGI | 3.94ct | Cushion | FANCY | VS1 | Ideal
From $1,098
Compare at $2,366
IGI | 3.96ct | Cushion | F | VVS2 | Very Good
From $1,117
Compare at $1,155
Save 59.7%IGI | 3.95ct | Cushion | D | VS1 | Very Good
From $1,119
Compare at $2,779
Save 50%IGI | 3.9ct | Cushion | F | VS1 | Very Good
From $1,120
Compare at $2,241
Save 59.9%IGI | 3.97ct | Cushion | D | VS1 | Very Good
From $1,125
Compare at $2,805
Save 62.3%IGI | 3.92ct | Cushion | D | VVS2 | Very Good
From $1,153
Compare at $3,055
Save 47.9%IGI | 3.97ct | Cushion | F | VS1 | Excellent
From $1,173
Compare at $2,250
Save 47.2%IGI | 3.95ct | Cushion | F | VS1 | Very Good
From $1,178
Compare at $2,233
Save 61.8%IGI | 3.93ct | Cushion | D | VVS2 | Very Good
From $1,180
Compare at $3,086
Save 25.5%IGI | 3.98ct | Cushion | E | VVS2 | Very Good
From $1,189
Compare at $1,597
Save 47.4%IGI | 3.98ct | Cushion | F | VS1 | Excellent
From $1,189
Compare at $2,262
Save 62.1%IGI | 3.97ct | Cushion | D | VVS2 | Very Good
From $1,192
Compare at $3,146
Save 62.1%IGI | 3.97ct | Cushion | D | VVS2 | Very Good
From $1,192
Compare at $3,146
Save 14.5%IGI | 3.92ct | Cushion | D | VVS2 | Excellent
From $1,194
Compare at $1,396
Save 79.8%IGI | 3.99ct | Cushion | E | VVS2 | Excellent
From $1,273
Compare at $6,310
Save 53.5%IGI | 3.95ct | Cushion | D | VS1 | Very Good
From $1,315
Compare at $2,829
Save 40.1%IGI | 3.99ct | Cushion | D | VS1 | Ideal
From $1,345
Compare at $2,247
Save 36.4%IGI | 3.94ct | Cushion | E | VS1 | Ideal
From $1,355
Compare at $2,130
Save 36.4%IGI | 3.99ct | Cushion | E | VS1 | Excellent
From $1,372
Compare at $2,157
Save 36.4%IGI | 3.99ct | Cushion | E | VS1 | Ideal
From $1,372
Compare at $2,157
Entry pricing in this category starts around $518.
What to Know When Shopping for 3.9 Carat Cushion Lab Grown Diamonds
- Always compare identical certified diamonds across retailers. Identical certificate numbers can have price differences of $27,522 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 $2,977 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 121 comparable stones in this segment. Prices start around $518 and go up to $28,040.
Based on the latest market data, the average asking price is about $4,078 with a median around $2,977.
The observed spread is roughly $27,522 across tracked listings, which is about 98.2% 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 $4,078. The median price is $2,977, 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 8 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 $27,522 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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