3.9 Carat Cushion Lab Grown Diamond Prices Comparison
As of February 2026, 3.9 carat cushion lab grown diamonds usually range from $843 to $24,869, with an average price of $3,317.In the last month, prices for these diamonds are down 4.2%.Compare 162 verified listings across 8 retailers tracked by CaratRadar.
3.9 Carat Cushion Lab Grown Diamond Market Overview
CaratRadar currently tracks 162 verified 3.9-carat cushion lab grown diamonds listed across 8 online retailers. Prices in this segment range from $843 to $24,869, with an average asking price of $3,317 and a median of $2,059.
The price spread of $24,026 (96.6% 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.
162 diamonds tracked in this segment
Price range: $843 to $24,869
Average price: $3,317
Median price: $2,059
Available across 8 retailers
Savings potential: up to 96.6%
Price Range Overview
As of Feb 28, 2026Real market range for this carat, shape, and diamond type.
162
$843
$3,317
$2,059
$24,869
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 75.6%3.86ct | Cushion | F | VS2 | Ideal
From $1,266
Compare at $5,190
GIASave 67.7%3.86ct | Cushion | D | VVS1 | Excellent
From $3,820
Compare at $11,820
IGISave 66.9%3.86ct | Cushion | D | VVS1 | Very Good
From $3,399
Compare at $10,280
IGISave 85.8%3.86ct | Cushion | D | VS1 | Ideal
From $1,307
Compare at $9,210
IGISave 34.6%3.86ct | Cushion | F | VVS2 | Very Good
From $2,041
Compare at $3,121
IGISave 80.7%3.86ct | Cushion | F | VVS2 | Ideal
From $1,033
Compare at $5,340
IGISave 80.3%3.86ct | Cushion | D | VVS2 | Ideal
From $1,385
Compare at $7,020
IGISave 80.6%3.86ct | Cushion | D | VS1 | Very Good
From $1,784
Compare at $9,210
IGISave 76.7%3.86ct | Cushion | D | VS1 | Very Good
From $2,054
Compare at $8,830
IGISave 40.2%3.86ct | Cushion | D | VVS2 | Very Good
From $1,841
Compare at $3,078
IGISave 18.3%3.86ct | Cushion | E | VVS2 | Ideal
From $6,400
Compare at $7,836
IGISave 86.7%3.86ct | Cushion | G | VS1 | Ideal
From $964
Compare at $7,270
IGISave 59.8%3.86ct | Cushion | FANCY | VVS2 | Excellent
From $3,805
Compare at $9,462
IGISave 76.1%3.86ct | Cushion | E | VVS2 | Ideal
From $1,768
Compare at $7,400
IGISave 83.3%3.86ct | Cushion | G | VS2 | Ideal
From $1,007
Compare at $6,020
IGISave 85.9%3.86ct | Cushion | E | VVS2 | Excellent
From $1,544
Compare at $10,920
GCALSave 75.7%3.86ct | Cushion | D | IF | Excellent
From $7,568
Compare at $31,130
IGISave 84.5%3.86ct | Cushion | E | VS2 | Ideal
From $1,156
Compare at $7,450
IGISave 59.8%3.86ct | Cushion | FANCY | VVS2 | Very Good
From $3,805
Compare at $9,462
IGI3.86ct | Cushion | E | VVS2 | Excellent
From $2,757
Compare at $2,917
IGISave 85.9%3.86ct | Cushion | E | VVS2 | Excellent
From $1,544
Compare at $10,920
IGISave 81.1%3.86ct | Cushion | E | VVS2 | Ideal
From $1,917
Compare at $10,160
IGISave 23%3.86ct | Cushion | E | VS1 | Excellent
From $6,240
Compare at $8,106
IGISave 81.7%3.87ct | Cushion | D | VVS1 | Ideal
From $2,773
Compare at $15,170
IGISave 20.2%3.87ct | Cushion | G | VS1 | Very Good
From $1,394
Compare at $1,747
IGISave 18.4%3.87ct | Cushion | E | VVS2 | Ideal
From $1,044
Compare at $1,279
GCALSave 76.7%3.87ct | Cushion | F | VS1 | Excellent
From $1,899
Compare at $8,160
IGISave 53%3.87ct | Cushion | D | VVS2 | Very Good
From $2,201
Compare at $4,680
IGISave 76.9%3.87ct | Cushion | E | VS1 | Very Good
From $1,940
Compare at $8,380
IGISave 54.8%3.87ct | Cushion | E | VS1 | Very Good
From $1,400
Compare at $3,095
IGISave 60.1%3.87ct | Cushion | D | VVS2 | Very Good
From $1,867
Compare at $4,680
IGISave 81.6%3.87ct | Cushion | F | VS1 | Very Good
From $2,575
Compare at $14,010
IGISave 72.4%3.87ct | Cushion | D | VVS1 | Good
From $4,194
Compare at $15,170
IGISave 85.8%3.87ct | Cushion | E | VVS2 | Excellent
From $1,517
Compare at $10,680
IGISave 62.1%3.87ct | Cushion | D | VVS2 | Very Good
From $3,264
Compare at $8,610
IGISave 63.3%3.87ct | Cushion | D | VVS2 | Ideal
From $2,872
Compare at $7,830
IGISave 81.2%3.87ct | Cushion | E | VVS2 | Very Good
From $1,991
Compare at $10,590
IGISave 80.7%3.87ct | Cushion | E | VS1 | Very Good
From $1,068
Compare at $5,540
GCALSave 76.8%3.88ct | Cushion | E | VVS2 | Excellent
From $2,018
Compare at $8,700
GIASave 63.4%3.88ct | Cushion | D | VVS1 | Excellent
From $4,590
Compare at $12,550
IGISave 81.7%3.88ct | Cushion | D | VVS1 | Ideal
From $2,779
Compare at $15,210
IGISave 76.2%3.88ct | Cushion | D | VVS1 | Ideal
From $3,359
Compare at $14,130
IGISave 81.2%3.88ct | Cushion | E | VVS2 | Very Good
From $1,995
Compare at $10,620
IGISave 85.8%3.88ct | Cushion | D | VS1 | Ideal
From $1,312
Compare at $9,260
IGISave 71.8%3.88ct | Cushion | E | VS1 | Ideal
From $2,542
Compare at $9,000
IGISave 42.8%3.88ct | Cushion | E | VS2 | Ideal
From $908
Compare at $1,586
GCALSave 76.9%3.88ct | Cushion | F | VS2 | Excellent
From $1,805
Compare at $7,800
IGISave 14.6%3.88ct | Cushion | E | VVS2 | Excellent
From $6,730
Compare at $7,876
IGISave 43.9%3.88ct | Cushion | D | VVS1 | Very Good
From $2,852
Compare at $5,085
IGISave 28.5%3.88ct | Cushion | D | FL | Very Good
From $15,661
Compare at $21,896
Entry pricing in this category starts around $843.
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 $24,026 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 $2,059 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 162 comparable stones in this segment. Prices start around $843 and go up to $24,869.
Based on the latest market data, the average asking price is about $3,317 with a median around $2,059.
The observed spread is roughly $24,026 across tracked listings, which is about 96.6% 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 $2,059, 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 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 $24,026 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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