3.9 Carat Cushion Lab Grown Diamond Prices Comparison
As of July 2026, 3.9 carat cushion lab grown diamonds usually range from $518 to $28,004, with an average price of $3,723.In the last month, prices for these diamonds are down 4.1%.Compare 147 verified listings across 6 retailers tracked by CaratRadar.
3.9 Carat Cushion Lab Grown Diamond Market Overview
CaratRadar currently tracks 147 verified 3.9-carat cushion lab grown diamonds listed across 6 online retailers. Prices in this segment range from $518 to $28,004, with an average asking price of $3,723 and a median of $2,572.
The price spread of $27,486 (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.
147 diamonds tracked in this segment
Price range: $518 to $28,004
Average price: $3,723
Median price: $2,572
Available across 6 retailers
Savings potential: up to 98.2%
Price Range Overview
As of Jul 14, 2026Real market range for this carat, shape, and diamond type.
147
$518
$3,723
$2,572
$28,004
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 67.4%IGI | 3.97ct | Cushion | G | VS1 | Excellent
From $662
Compare at $2,031
Save 71.3%IGI | 3.91ct | Cushion | F | SI2 | Very Good
From $683
Compare at $2,380
Save 71.7%IGI | 3.92ct | Cushion | G | VVS2 | Excellent
From $710
Compare at $2,513
Save 71.9%IGI | 3.9ct | Cushion | E | VVS2 | Very Good
From $711
Compare at $2,527
Save 70.4%IGI | 3.93ct | Cushion | F | VVS2 | Excellent
From $714
Compare at $2,410
Save 70.4%IGI | 3.93ct | Cushion | F | VVS2 | Ideal
From $714
Compare at $2,410
Save 69.9%IGI | 3.9ct | Cushion | E | VS1 | Very Good
From $714
Compare at $2,370
Save 70%IGI | 3.92ct | Cushion | E | VS1 | Very Good
From $717
Compare at $2,392
Save 69.6%IGI | 3.9ct | Cushion | E | VS1 | Very Good
From $721
Compare at $2,372
Save 69.6%IGI | 3.9ct | Cushion | E | VS1 | Excellent
From $721
Compare at $2,372
Save 69.6%IGI | 3.9ct | Cushion | E | VS1 | Excellent
From $721
Compare at $2,372
Save 70.1%IGI | 3.94ct | Cushion | E | VS1 | Very Good
From $722
Compare at $2,416
Save 70.3%IGI | 3.96ct | Cushion | E | VS1 | Very Good
From $725
Compare at $2,438
Save 69.6%IGI | 3.9ct | Cushion | F | VVS2 | Excellent
From $725
Compare at $2,381
Save 69.8%IGI | 3.93ct | Cushion | E | VS1 | Excellent
From $727
Compare at $2,406
Save 69.9%IGI | 3.94ct | Cushion | E | VS1 | Very Good
From $728
Compare at $2,418
Save 70.1%IGI | 3.98ct | Cushion | E | VS1 | Very Good
From $736
Compare at $2,465
Save 70.2%IGI | 3.99ct | Cushion | E | VS1 | Ideal
From $738
Compare at $2,476
Save 70.2%IGI | 3.99ct | Cushion | E | VS1 | Ideal
From $738
Compare at $2,476
Save 65.7%IGI | 3.91ct | Cushion | F | VS1 | Very Good
From $755
Compare at $2,201
Save 65.8%IGI | 3.92ct | Cushion | F | VS1 | Excellent
From $757
Compare at $2,211
Save 65.8%IGI | 3.92ct | Cushion | F | VS1 | Very Good
From $757
Compare at $2,211
Save 70.1%IGI | 3.96ct | Cushion | E | VVS2 | Excellent
From $760
Compare at $2,544
Save 65.4%IGI | 3.91ct | Cushion | F | VS1 | Ideal
From $761
Compare at $2,201
Save 65.9%IGI | 3.94ct | Cushion | F | VS1 | Excellent
From $761
Compare at $2,233
Save 66%IGI | 3.95ct | Cushion | F | VS1 | Very Good
From $763
Compare at $2,243
Save 66%IGI | 3.96ct | Cushion | F | VS1 | Excellent
From $765
Compare at $2,253
Save 66.3%IGI | 3.99ct | Cushion | F | VS1 | Very Good
From $771
Compare at $2,286
Save 66.3%IGI | 3.99ct | Cushion | F | VS1 | Excellent
From $771
Compare at $2,286
Save 66.3%IGI | 3.99ct | Cushion | F | VS1 | Excellent
From $771
Compare at $2,286
Save 65.7%IGI | 3.96ct | Cushion | F | VS1 | Very Good
From $773
Compare at $2,256
Save 65.9%IGI | 3.98ct | Cushion | F | VS1 | Excellent
From $777
Compare at $2,277
Save 65.9%IGI | 3.98ct | Cushion | F | VS1 | Very Good
From $777
Compare at $2,277
Save 65.9%IGI | 3.98ct | Cushion | F | VS1 | Very Good
From $777
Compare at $2,277
Save 66%IGI | 3.99ct | Cushion | F | VS1 | Ideal
From $779
Compare at $2,288
Save 66%IGI | 3.99ct | Cushion | F | VS1 | Very Good
From $779
Compare at $2,288
Save 66%IGI | 3.99ct | Cushion | F | VS1 | Very Good
From $779
Compare at $2,288
Save 64%IGI | 3.93ct | Cushion | E | VS2 | Very Good
From $785
Compare at $2,180
Save 74.7%IGI | 3.92ct | Cushion | E | VVS2 | Excellent
From $813
Compare at $3,210
Save 53.5%IGI | 3.98ct | Cushion | F | VS1 | Excellent
From $837
Compare at $1,799
Save 74.2%IGI | 3.95ct | Cushion | FANCY | VS1 | Very Good
From $838
Compare at $3,251
Save 66.9%IGI | 3.9ct | Cushion | E | VVS2 | Ideal
From $849
Compare at $2,568
Save 66.9%IGI | 3.9ct | Cushion | E | VVS2 | Excellent
From $849
Compare at $2,568
Save 67.1%IGI | 3.93ct | Cushion | E | VVS2 | Excellent
From $856
Compare at $2,604
Save 67.2%IGI | 3.94ct | Cushion | E | VVS2 | Excellent
From $858
Compare at $2,618
Save 67.2%IGI | 3.94ct | Cushion | E | VVS2 | Excellent
From $858
Compare at $2,618
Save 28.9%IGI | 3.9ct | Cushion | E | VVS2 | Very Good
From $862
Compare at $1,212
Save 67.3%IGI | 3.96ct | Cushion | E | VVS2 | Very Good
From $863
Compare at $2,643
Save 67.5%IGI | 3.97ct | Cushion | E | VVS2 | Excellent
From $864
Compare at $2,656
Save 67.5%IGI | 3.97ct | Cushion | E | VVS2 | Very Good
From $864
Compare at $2,656
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 $27,486 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 $2,572 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 147 comparable stones in this segment. Prices start around $518 and go up to $28,004.
Based on the latest market data, the average asking price is about $3,723 with a median around $2,572.
The observed spread is roughly $27,486 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 $3,723. The median price is $2,572, 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 6 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 $27,486 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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