3.9 Carat Radiant Lab Grown Diamond Prices Comparison
As of February 2026, 3.9 carat radiant lab grown diamonds usually range from $732 to $29,380, with an average price of $1,786.In the last month, prices for these diamonds are down 9.1%.Compare 677 verified listings across 9 retailers tracked by CaratRadar.
3.9 Carat Radiant Lab Grown Diamond Market Overview
CaratRadar currently tracks 677 verified 3.9-carat radiant lab grown diamonds listed across 9 online retailers. Prices in this segment range from $732 to $29,380, with an average asking price of $1,786 and a median of $1,253.
The price spread of $28,648 (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.
677 diamonds tracked in this segment
Price range: $732 to $29,380
Average price: $1,786
Median price: $1,253
Available across 9 retailers
Savings potential: up to 97.5%
Price Range Overview
As of Feb 28, 2026Real market range for this carat, shape, and diamond type.
677
$732
$1,786
$1,253
$29,380
Price History
Price Comparison Matrix
Live Listings
See all listingsCompare current retailer offers for this exact segment and open any listing for full details.
GCALSave 76.8%3.86ct | Radiant | E | VVS2 | Excellent
From $2,007
Compare at $8,650
IGISave 86.9%3.86ct | Radiant | E | VS1 | Very Good
From $1,166
Compare at $8,875
GIASave 74.7%3.86ct | Radiant | E | VS1 | Excellent
From $2,227
Compare at $8,810
GIASave 72.6%3.86ct | Radiant | E | VVS2 | Ideal
From $2,537
Compare at $9,250
GIASave 16.6%3.86ct | Radiant | E | VVS1 | Excellent
From $3,456
Compare at $4,143
IGISave 71.3%3.86ct | Radiant | G | SI1 | Very Good
From $773
Compare at $2,692
IGISave 84.7%3.86ct | Radiant | E | VS1 | Ideal
From $1,327
Compare at $8,660
IGISave 75.3%3.86ct | Radiant | D | VVS2 | Ideal
From $1,734
Compare at $7,020
IGISave 77.1%3.86ct | Radiant | D | VVS2 | Ideal
From $2,213
Compare at $9,670
3.86ct | Radiant | G | VS2 | Ideal
From $934
Compare at $3,730
GIASave 60.7%3.86ct | Radiant | D | VVS2 | Excellent
From $3,381
Compare at $8,610
GIASave 73.1%3.86ct | Radiant | D | VVS1 | Ideal
From $4,425
Compare at $16,420
GIASave 72.9%3.86ct | Radiant | E | VVS2 | Ideal
From $2,507
Compare at $9,250
IGISave 76.5%3.86ct | Radiant | D | IF | Excellent
From $6,807
Compare at $28,970
IGISave 77.3%3.86ct | Radiant | E | VS1 | Ideal
From $1,241
Compare at $5,460
IGISave 63.9%3.86ct | Radiant | E | VS2 | Excellent
From $1,087
Compare at $3,010
IGISave 64.1%3.86ct | Radiant | E | VS1 | Very Good
From $1,191
Compare at $3,315
IGISave 64.1%3.86ct | Radiant | E | VS1 | Very Good
From $1,191
Compare at $3,315
IGISave 70.7%3.86ct | Radiant | E | VVS2 | Very Good
From $1,243
Compare at $4,245
IGISave 70.4%3.86ct | Radiant | E | VVS2 | Very Good
From $1,255
Compare at $4,245
IGISave 69.3%3.86ct | Radiant | E | VVS2 | Very Good
From $1,305
Compare at $4,245
IGISave 70.4%3.86ct | Radiant | E | VVS2 | Very Good
From $1,255
Compare at $4,245
IGISave 81.5%3.86ct | Radiant | E | VVS2 | Ideal
From $1,373
Compare at $7,410
IGISave 63.2%3.86ct | Radiant | E | VS1 | Excellent
From $1,179
Compare at $3,200
IGISave 69.6%3.86ct | Radiant | E | VVS2 | Very Good
From $1,243
Compare at $4,090
IGISave 67.1%3.86ct | Radiant | D | VS1 | Very Good
From $1,243
Compare at $3,780
IGISave 69.1%3.86ct | Radiant | E | VVS2 | Excellent
From $1,264
Compare at $4,090
IGISave 70.2%3.86ct | Radiant | E | VVS2 | Ideal
From $1,264
Compare at $4,245
IGISave 70.6%3.86ct | Radiant | E | VVS2 | Ideal
From $1,250
Compare at $4,245
IGISave 69.3%3.86ct | Radiant | E | VVS2 | Ideal
From $1,305
Compare at $4,245
IGISave 67.1%3.86ct | Radiant | D | VS1 | Excellent
From $1,243
Compare at $3,780
IGISave 73.4%3.86ct | Radiant | F | VS1 | Very Good
From $1,251
Compare at $4,710
IGISave 75.1%3.86ct | Radiant | F | VS2 | Very Good
From $1,088
Compare at $4,370
IGISave 68.4%3.86ct | Radiant | E | VVS2 | Very Good
From $1,292
Compare at $4,090
IGISave 69.6%3.86ct | Radiant | E | VVS2 | Very Good
From $1,292
Compare at $4,245
IGISave 69.1%3.86ct | Radiant | F | VVS2 | Excellent
From $1,166
Compare at $3,780
IGISave 69.4%3.86ct | Radiant | E | VVS2 | Excellent
From $1,250
Compare at $4,090
IGISave 69.3%3.86ct | Radiant | E | VVS2 | Ideal
From $1,305
Compare at $4,245
IGISave 69.3%3.86ct | Radiant | E | VVS2 | Ideal
From $1,305
Compare at $4,245
IGISave 18.9%3.86ct | Radiant | G | VS1 | Very Good
From $899
Compare at $1,109
IGISave 70%3.86ct | Radiant | F | VVS2 | Very Good
From $1,179
Compare at $3,935
IGISave 63.7%3.86ct | Radiant | E | VS1 | Very Good
From $1,204
Compare at $3,315
IGISave 82.3%3.86ct | Radiant | D | VVS2 | Ideal
From $1,895
Compare at $10,690
IGISave 69.1%3.86ct | Radiant | F | VVS2 | Excellent
From $1,166
Compare at $3,780
IGISave 45.7%3.86ct | Radiant | F | VVS2 | Ideal
From $926
Compare at $1,704
IGISave 83.6%3.86ct | Radiant | FANCY | VVS2 | Excellent
From $1,275
Compare at $7,785
IGISave 63.7%3.86ct | Radiant | D | VS1 | Ideal
From $2,788
Compare at $7,690
IGISave 84%3.86ct | Radiant | F | VS1 | Ideal
From $1,227
Compare at $7,680
GIASave 72.6%3.86ct | Radiant | E | VVS2 | Ideal
From $2,537
Compare at $9,250
GIASave 32.7%3.86ct | Radiant | D | VVS2 | Excellent
From $2,853
Compare at $4,239
Entry pricing in this category starts around $732.
What to Know When Shopping for 3.9 Carat Radiant Lab Grown Diamonds
- Always compare identical certified diamonds across retailers. Identical certificate numbers can have price differences of $28,648 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 $1,253 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.
- Radiant cuts combine the elegance of emerald shapes with the brilliance of round cuts, offering good value per carat.
Frequently Asked Questions
We currently track 677 comparable stones in this segment. Prices start around $732 and go up to $29,380.
Based on the latest market data, the average asking price is about $1,786 with a median around $1,253.
The observed spread is roughly $28,648 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 $1,253, 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 9 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 $28,648 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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