3.9 Carat Cushion Lab Grown Diamond Prices Comparison
As of April 2026, 3.9 carat cushion lab grown diamonds usually range from $647 to $25,695, with an average price of $4,498.In the last month, prices for these diamonds are up 0.6%.Compare 136 verified listings across 7 retailers tracked by CaratRadar.
3.9 Carat Cushion Lab Grown Diamond Market Overview
CaratRadar currently tracks 136 verified 3.9-carat cushion lab grown diamonds listed across 7 online retailers. Prices in this segment range from $647 to $25,695, with an average asking price of $4,498 and a median of $3,380.
The price spread of $25,047 (97.5% 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.
136 diamonds tracked in this segment
Price range: $647 to $25,695
Average price: $4,498
Median price: $3,380
Available across 7 retailers
Savings potential: up to 97.5%
Price Range Overview
As of Apr 14, 2026Real market range for this carat, shape, and diamond type.
136
$647
$4,498
$3,380
$25,695
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 39.6%GIA | 3.9ct | Cushion | H | VVS1 | Very Good
From $3,319
Compare at $5,491
Save 72.9%GIA | 3.9ct | Cushion | E | VVS2 | Excellent
From $4,539
Compare at $16,730
Save 71.6%IGI | 3.9ct | Cushion | G | VS1 | Ideal
From $1,163
Compare at $4,100
Save 74.5%IGI | 3.9ct | Cushion | G | VS2 | Very Good
From $1,205
Compare at $4,720
Save 73.2%IGI | 3.9ct | Cushion | D | VVS1 | Ideal
From $5,164
Compare at $19,300
Save 72.4%IGI | 3.9ct | Cushion | D | VVS2 | Ideal
From $3,289
Compare at $11,910
Save 79.8%IGI | 3.9ct | Cushion | E | VVS2 | Very Good
From $1,176
Compare at $5,820
Save 61.6%IGI | 3.9ct | Cushion | F | VVS2 | Very Good
From $3,153
Compare at $8,220
Save 54.3%IGI | 3.9ct | Cushion | E | VVS2 | Ideal
From $2,994
Compare at $6,550
Save 77.3%IGI | 3.9ct | Cushion | E | VVS2 | Very Good
From $1,837
Compare at $8,090
Save 74.7%IGI | 3.9ct | Cushion | D | IF | Ideal
From $6,440
Compare at $25,440
Save 74.7%IGI | 3.9ct | Cushion | D | IF | Ideal
From $6,440
Compare at $25,440
Save 74.7%IGI | 3.9ct | Cushion | D | IF | Very Good
From $6,440
Compare at $25,440
Save 72.4%IGI | 3.9ct | Cushion | E | VVS1 | Very Good
From $3,279
Compare at $11,880
Save 69.4%IGI | 3.9ct | Cushion | E | VS2 | Excellent
From $2,243
Compare at $7,320
Save 72.4%IGI | 3.9ct | Cushion | D | VVS2 | Very Good
From $3,241
Compare at $11,740
Save 69.9%IGI | 3.9ct | Cushion | D | VVS1 | Very Good
From $4,674
Compare at $15,530
Save 41.1%IGI | 3.9ct | Cushion | E | VVS1 | Very Good
From $2,960
Compare at $5,022
Save 27.7%IGI | 3.9ct | Cushion | E | VVS2 | Very Good
From $960
Compare at $1,327
Save 28.7%IGI | 3.9ct | Cushion | D | VVS1 | Very Good
From $2,950
Compare at $4,136
IGI | 3.9ct | Cushion | F | VVS2 | Excellent
From $1,000
Compare at $7,400
Save 53.7%IGI | 3.9ct | Cushion | E | VS2 | Ideal
From $2,243
Compare at $4,840
Save 83.4%IGI | 3.91ct | Cushion | I | VS2 | Ideal
From $830
Compare at $5,010
Save 62.8%IGI | 3.91ct | Cushion | H | VVS2 | Ideal
From $2,449
Compare at $6,590
Save 75.1%IGI | 3.91ct | Cushion | G | VS1 | Very Good
From $1,663
Compare at $6,680
Save 77.9%IGI | 3.91ct | Cushion | F | VVS2 | Ideal
From $2,410
Compare at $10,910
Save 69.7%IGI | 3.91ct | Cushion | D | IF | Ideal
From $7,398
Compare at $24,389
Save 79.4%IGI | 3.91ct | Cushion | E | VVS2 | Ideal
From $2,081
Compare at $10,110
Save 65.2%IGI | 3.91ct | Cushion | D | VVS1 | Ideal
From $2,789
Compare at $8,010
Save 63.9%IGI | 3.91ct | Cushion | E | VVS2 | Ideal
From $2,250
Compare at $6,230
Save 65.8%IGI | 3.91ct | Cushion | E | VVS2 | Ideal
From $2,250
Compare at $6,570
Save 62.7%IGI | 3.91ct | Cushion | F | VVS1 | Ideal
From $3,605
Compare at $9,670
Save 68.4%IGI | 3.91ct | Cushion | D | VVS1 | Ideal
From $2,675
Compare at $8,460
Save 76.5%IGI | 3.91ct | Cushion | E | VVS2 | Very Good
From $1,690
Compare at $7,200
Save 72.4%IGI | 3.91ct | Cushion | D | VS1 | Very Good
From $3,246
Compare at $11,760
Save 72.8%IGI | 3.91ct | Cushion | D | VVS1 | Ideal
From $3,600
Compare at $13,230
Save 84.5%IGI | 3.91ct | Cushion | D | VVS2 | Excellent
From $1,686
Compare at $10,890
Save 63.4%IGI | 3.91ct | Cushion | D | VVS1 | Very Good
From $2,935
Compare at $8,010
Save 72.4%IGI | 3.91ct | Cushion | D | VVS2 | Ideal
From $1,864
Compare at $6,760
Save 29.5%IGI | 3.91ct | Cushion | E | VVS2 | Very Good
From $900
Compare at $1,277
Save 37.8%GIA | 3.92ct | Cushion | F | VVS2 | Ideal
From $3,235
Compare at $5,200
Save 54.1%GIA | 3.92ct | Cushion | D | VVS2 | Excellent
From $5,005
Compare at $10,910
Save 73%GIA | 3.92ct | Cushion | D | IF | Excellent
From $8,902
Compare at $32,920
Save 41.3%IGI | 3.92ct | Cushion | G | VVS2 | Excellent
From $1,217
Compare at $2,071
Save 68.9%IGI | 3.92ct | Cushion | D | VVS1 | Ideal
From $3,948
Compare at $12,680
Save 71.5%IGI | 3.92ct | Cushion | E | VS2 | Ideal
From $2,576
Compare at $9,030
Save 78.1%IGI | 3.92ct | Cushion | E | VS1 | Ideal
From $1,384
Compare at $6,310
Save 71.8%IGI | 3.92ct | Cushion | E | VS1 | Ideal
From $2,568
Compare at $9,090
Save 72.4%IGI | 3.92ct | Cushion | D | VVS1 | Ideal
From $3,398
Compare at $12,310
Save 72.4%IGI | 3.92ct | Cushion | D | VVS2 | Very Good
From $3,257
Compare at $11,800
Entry pricing in this category starts around $647.
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 $25,047 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 $3,380 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 136 comparable stones in this segment. Prices start around $647 and go up to $25,695.
Based on the latest market data, the average asking price is about $4,498 with a median around $3,380.
The observed spread is roughly $25,047 across tracked listings, which is about 97.5% 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 $3,380, 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 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 $25,047 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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