3.9 Carat Radiant Lab Grown Diamond Prices Comparison
As of April 2026, 3.9 carat radiant lab grown diamonds usually range from $615 to $18,866, with an average price of $3,275.In the last month, prices for these diamonds are down 4.5%.Compare 1,607 verified listings across 9 retailers tracked by CaratRadar.
3.9 Carat Radiant Lab Grown Diamond Market Overview
CaratRadar currently tracks 1,607 verified 3.9-carat radiant lab grown diamonds listed across 9 online retailers. Prices in this segment range from $615 to $18,866, with an average asking price of $3,275 and a median of $2,368.
The price spread of $18,251 (96.7% 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.
1,607 diamonds tracked in this segment
Price range: $615 to $18,866
Average price: $3,275
Median price: $2,368
Available across 9 retailers
Savings potential: up to 96.7%
Price Range Overview
As of Apr 14, 2026Real market range for this carat, shape, and diamond type.
1,607
$615
$3,275
$2,368
$18,866
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 77.7%GCAL | 3.9ct | Radiant | E | VVS2 | Excellent
From $1,883
Compare at $8,440
GIA | 3.9ct | Radiant | D | VVS2 | Ideal
From $10,810
Save 69.5%GIA | 3.9ct | Radiant | D | VVS2 | Excellent
From $2,649
Compare at $8,690
Save 73.8%GIA | 3.9ct | Radiant | E | VVS2 | Excellent
From $3,780
Compare at $14,450
Save 54.5%GIA | 3.9ct | Radiant | E | VS1 | Excellent
From $2,965
Compare at $6,516
GIA | 3.9ct | Radiant | E | VVS1 | Ideal
From $8,170
Compare at $8,550
Save 59.1%GIA | 3.9ct | Radiant | D | IF | Ideal
From $13,595
Compare at $33,280
Save 78.5%IGI | 3.9ct | Radiant | F | VS1 | Excellent
From $1,694
Compare at $7,890
Save 76.3%IGI | 3.9ct | Radiant | D | IF | Ideal
From $7,097
Compare at $29,920
Save 76.2%IGI | 3.9ct | Radiant | F | VS1 | Ideal
From $1,496
Compare at $6,290
Save 75.8%IGI | 3.9ct | Radiant | E | VS2 | Very Good
From $1,105
Compare at $4,560
Save 36.4%IGI | 3.9ct | Radiant | E | VVS2 | Ideal
From $3,229
Compare at $5,081
Save 78.5%IGI | 3.9ct | Radiant | F | VVS2 | Ideal
From $1,609
Compare at $7,500
Save 68.1%IGI | 3.9ct | Radiant | D | VS1 | Ideal
From $1,267
Compare at $3,975
Save 65.5%IGI | 3.9ct | Radiant | E | VS1 | Excellent
From $1,115
Compare at $3,235
Save 75.1%IGI | 3.9ct | Radiant | F | VS1 | Very Good
From $1,810
Compare at $7,270
Save 65.6%IGI | 3.9ct | Radiant | E | VS2 | Ideal
From $1,086
Compare at $3,155
Save 66.8%IGI | 3.9ct | Radiant | D | VS1 | Ideal
From $1,267
Compare at $3,820
Save 70.5%IGI | 3.9ct | Radiant | E | VVS2 | Excellent
From $1,216
Compare at $4,130
Save 25.4%IGI | 3.9ct | Radiant | E | VVS2 | Very Good
From $1,216
Compare at $1,630
Save 40.3%IGI | 3.9ct | Radiant | D | VVS2 | Very Good
From $1,447
Compare at $2,424
Save 71.6%IGI | 3.9ct | Radiant | E | VVS2 | Very Good
From $1,216
Compare at $4,290
Save 66.7%IGI | 3.9ct | Radiant | E | VS1 | Very Good
From $1,115
Compare at $3,350
IGI | 3.9ct | Radiant | E | VS1 | Very Good
From $1,115
Compare at $3,350
IGI | 3.9ct | Radiant | E | VS1 | Very Good
From $1,115
Compare at $3,350
Save 71.6%IGI | 3.9ct | Radiant | E | VVS2 | Ideal
From $1,216
Compare at $4,290
Save 75.1%IGI | 3.9ct | Radiant | F | VS1 | Ideal
From $1,810
Compare at $7,270
Save 84%IGI | 3.9ct | Radiant | E | VS1 | Very Good
From $975
Compare at $6,100
Save 66.7%IGI | 3.9ct | Radiant | E | VS1 | Very Good
From $1,115
Compare at $3,350
Save 65.1%IGI | 3.9ct | Radiant | E | VS2 | Ideal
From $1,100
Compare at $3,155
Save 21.8%IGI | 3.9ct | Radiant | E | VS2 | Very Good
From $1,188
Compare at $1,519
Save 71.6%IGI | 3.9ct | Radiant | E | VVS2 | Very Good
From $1,216
Compare at $4,290
Save 70.5%IGI | 3.9ct | Radiant | E | VVS2 | Very Good
From $1,216
Compare at $4,130
Save 68.1%IGI | 3.9ct | Radiant | D | VS1 | Very Good
From $1,267
Compare at $3,975
Save 72.7%IGI | 3.9ct | Radiant | F | VVS2 | Very Good
From $1,086
Compare at $3,975
Save 70.5%IGI | 3.9ct | Radiant | D | VVS2 | Very Good
From $1,447
Compare at $4,910
Save 66.7%IGI | 3.9ct | Radiant | E | VS1 | Very Good
From $1,115
Compare at $3,350
Save 69.3%IGI | 3.9ct | Radiant | D | VVS2 | Very Good
From $1,447
Compare at $4,715
Save 71.6%IGI | 3.9ct | Radiant | E | VVS2 | Very Good
From $1,216
Compare at $4,290
Save 74.5%IGI | 3.9ct | Radiant | F | VVS2 | Excellent
From $1,251
Compare at $4,910
Save 71.6%IGI | 3.9ct | Radiant | E | VVS2 | Very Good
From $1,216
Compare at $4,290
Save 71.6%IGI | 3.9ct | Radiant | E | VVS2 | Very Good
From $1,216
Compare at $4,290
Save 71.6%IGI | 3.9ct | Radiant | E | VVS2 | Ideal
From $1,216
Compare at $4,290
Save 66.7%IGI | 3.9ct | Radiant | E | VS1 | Ideal
From $1,115
Compare at $3,350
Save 71.6%IGI | 3.9ct | Radiant | E | VVS2 | Ideal
From $1,216
Compare at $4,290
Save 71.6%IGI | 3.9ct | Radiant | E | VVS2 | Ideal
From $1,216
Compare at $4,290
Save 71.6%IGI | 3.9ct | Radiant | E | VVS2 | Ideal
From $1,216
Compare at $4,290
Save 22.6%IGI | 3.9ct | Radiant | E | VS1 | Excellent
From $1,060
Compare at $1,370
Save 72.4%IGI | 3.9ct | Radiant | F | VVS2 | Ideal
From $1,099
Compare at $3,975
Save 80.2%IGI | 3.9ct | Radiant | F | VVS2 | Ideal
From $1,073
Compare at $5,420
Entry pricing in this category starts around $615.
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 $18,251 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 $2,368 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 1,607 comparable stones in this segment. Prices start around $615 and go up to $18,866.
Based on the latest market data, the average asking price is about $3,275 with a median around $2,368.
The observed spread is roughly $18,251 across tracked listings, which is about 96.7% 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 $2,368, 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 $18,251 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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