3.9 Carat Round Lab Grown Diamond Prices Comparison
As of February 2026, 3.9 carat round lab grown diamonds usually range from $638 to $31,320, with an average price of $1,543.In the last month, prices for these diamonds are down 3.6%.Compare 1,120 verified listings across 10 retailers tracked by CaratRadar.
3.9 Carat Round Lab Grown Diamond Market Overview
CaratRadar currently tracks 1,120 verified 3.9-carat round lab grown diamonds listed across 10 online retailers. Prices in this segment range from $638 to $31,320, with an average asking price of $1,543 and a median of $1,035.
The price spread of $30,682 (98.0% 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.
1,120 diamonds tracked in this segment
Price range: $638 to $31,320
Average price: $1,543
Median price: $1,035
Available across 10 retailers
Savings potential: up to 98.0%
Price Range Overview
As of Feb 28, 2026Real market range for this carat, shape, and diamond type.
1,120
$638
$1,543
$1,035
$31,320
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 87.9%3.86ct | Round | G | VS2 | Ideal
From $688
Compare at $5,700
IGISave 80.9%3.86ct | Round | G | VS1 | Ideal
From $749
Compare at $3,930
IGISave 88%3.86ct | Round | F | VS1 | Ideal
From $911
Compare at $7,600
IGISave 88.1%3.86ct | Round | F | VS1 | Ideal
From $899
Compare at $7,530
IGISave 81.2%3.86ct | Round | F | VS2 | Ideal
From $755
Compare at $4,020
IGISave 81.7%3.86ct | Round | G | VS1 | Ideal
From $700
Compare at $3,830
IGISave 81.7%3.86ct | Round | G | VS1 | Ideal
From $700
Compare at $3,830
IGISave 81.7%3.86ct | Round | G | VS1 | Ideal
From $700
Compare at $3,830
IGISave 81.2%3.86ct | Round | F | SI1 | Ideal
From $651
Compare at $3,460
IGISave 89.1%3.86ct | Round | F | VS2 | Ideal
From $725
Compare at $6,630
GCALSave 68%3.86ct | Round | E | VVS2 | Excellent
From $2,540
Compare at $7,930
GCALSave 75.9%3.86ct | Round | D | IF | Excellent
From $6,640
Compare at $27,580
GCALSave 76.1%3.86ct | Round | E | FL | Excellent
From $15,696
Compare at $65,713
GIASave 81.3%3.86ct | Round | D | VVS1 | Excellent
From $2,648
Compare at $14,140
GIASave 74.4%3.86ct | Round | D | VVS2 | Excellent
From $3,009
Compare at $11,760
GIASave 82.3%3.86ct | Round | D | VVS1 | Excellent
From $2,498
Compare at $14,140
GIASave 81.2%3.86ct | Round | F | VVS1 | Excellent
From $2,335
Compare at $12,430
GIA3.86ct | Round | E | VVS2 | Excellent
From $2,809
Compare at $2,875
IGISave 81.7%3.86ct | Round | G | VS1 | Ideal
From $700
Compare at $3,830
IGISave 71.9%3.86ct | Round | H | VS1 | Ideal
From $920
Compare at $3,270
IGISave 81.2%3.86ct | Round | F | VS2 | Ideal
From $755
Compare at $4,020
IGISave 81.2%3.86ct | Round | F | VS2 | Ideal
From $755
Compare at $4,020
IGISave 80.6%3.86ct | Round | G | VS2 | Ideal
From $736
Compare at $3,790
IGISave 81.2%3.86ct | Round | F | VS2 | Ideal
From $755
Compare at $4,020
IGISave 86.1%3.86ct | Round | D | IF | Ideal
From $3,073
Compare at $22,070
IGISave 81.7%3.86ct | Round | G | VS1 | Ideal
From $700
Compare at $3,830
IGISave 80.4%3.86ct | Round | F | VS2 | Ideal
From $780
Compare at $3,980
IGISave 81.7%3.86ct | Round | G | VS1 | Ideal
From $700
Compare at $3,830
IGISave 80.6%3.86ct | Round | G | VS1 | Ideal
From $743
Compare at $3,830
IGISave 82.7%3.86ct | Round | E | SI1 | Ideal
From $669
Compare at $3,860
IGISave 80.3%3.86ct | Round | F | SI1 | Ideal
From $693
Compare at $3,510
IGISave 81%3.86ct | Round | D | IF | Ideal
From $4,186
Compare at $22,070
IGISave 85.6%3.86ct | Round | D | VS1 | Ideal
From $1,054
Compare at $7,320
IGISave 81.8%3.86ct | Round | G | VS2 | Ideal
From $725
Compare at $3,980
IGISave 48.6%3.86ct | Round | E | VVS2 | Excellent
From $2,768
Compare at $5,380
IGISave 88.7%3.86ct | Round | E | VS1 | Excellent
From $991
Compare at $8,780
IGISave 85.5%3.86ct | Round | D | VVS2 | Ideal
From $1,370
Compare at $9,470
IGISave 85%3.86ct | Round | E | VS1 | Ideal
From $995
Compare at $6,640
IGISave 88.7%3.86ct | Round | E | VVS2 | Excellent
From $940
Compare at $8,350
IGISave 88.7%3.86ct | Round | E | VS1 | Ideal
From $995
Compare at $8,830
3.86ct | Round | D | VVS2 | Excellent
From $2,122
Compare at $11,210
IGISave 75.5%3.86ct | Round | F | VVS2 | Excellent
From $926
Compare at $3,780
GCALSave 77.6%3.86ct | Round | G | VS1 | Excellent
From $1,660
Compare at $7,410
GIASave 73.7%3.86ct | Round | D | VVS1 | Excellent
From $5,234
Compare at $19,900
IGISave 82.9%3.86ct | Round | H | VS1 | Ideal
From $940
Compare at $5,510
IGISave 64.7%3.86ct | Round | H | VS1 | Ideal
From $1,505
Compare at $4,260
IGISave 75.2%3.86ct | Round | G | VVS2 | Excellent
From $1,195
Compare at $4,820
IGISave 82.6%3.86ct | Round | F | VS2 | Ideal
From $1,050
Compare at $6,040
IGISave 83.5%3.86ct | Round | G | VS1 | Ideal
From $694
Compare at $4,200
IGISave 88.9%3.86ct | Round | G | VS2 | Ideal
From $694
Compare at $6,260
Entry pricing in this category starts around $638.
What to Know When Shopping for 3.9 Carat Round Lab Grown Diamonds
- Always compare identical certified diamonds across retailers. Identical certificate numbers can have price differences of $30,682 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 $1,035 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.
- Round brilliants command a premium due to higher rough waste during cutting. If budget matters, consider oval or cushion shapes for similar visual size.
Frequently Asked Questions
We currently track 1,120 comparable stones in this segment. Prices start around $638 and go up to $31,320.
Based on the latest market data, the average asking price is about $1,543 with a median around $1,035.
The observed spread is roughly $30,682 across tracked listings, which is about 98.0% 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 $1,035, 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 10 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 $30,682 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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