4.2 Carat Radiant Lab Grown Diamond Prices Comparison
As of February 2026, 4.2 carat radiant lab grown diamonds usually range from $788 to $27,976, with an average price of $3,939.In the last month, prices for these diamonds are down 2.7%.Compare 171 verified listings across 8 retailers tracked by CaratRadar.
4.2 Carat Radiant Lab Grown Diamond Market Overview
CaratRadar currently tracks 171 verified 4.2-carat radiant lab grown diamonds listed across 8 online retailers. Prices in this segment range from $788 to $27,976, with an average asking price of $3,939 and a median of $2,557.
The price spread of $27,188 (97.2% 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.
171 diamonds tracked in this segment
Price range: $788 to $27,976
Average price: $3,939
Median price: $2,557
Available across 8 retailers
Savings potential: up to 97.2%
Price Range Overview
As of Feb 28, 2026Real market range for this carat, shape, and diamond type.
171
$788
$3,939
$2,557
$27,976
Price History
Price Comparison Matrix
Live Listings
See all listingsCompare current retailer offers for this exact segment and open any listing for full details.
GIASave 65.9%4.16ct | Radiant | D | VVS1 | Ideal
From $6,918
Compare at $20,294
GIASave 72%4.16ct | Radiant | D | FL | Good
From $27,517
Compare at $98,200
IGISave 20.2%4.16ct | Radiant | H | VS1 | Ideal
From $968
Compare at $1,213
IGISave 80.1%4.16ct | Radiant | D | VS1 | Ideal
From $2,020
Compare at $10,170
4.16ct | Radiant | FANCY | VS1 | Excellent
From $7,125
Compare at $10,242
IGISave 77.6%4.16ct | Radiant | D | IF | Excellent
From $7,708
Compare at $34,344
IGI4.16ct | Radiant | E | VVS2 | Excellent
From $6,864
Compare at $7,390
IGISave 82.3%4.16ct | Radiant | E | VVS2 | Ideal
From $1,595
Compare at $9,010
IGISave 83.4%4.16ct | Radiant | F | VVS2 | Very Good
From $1,466
Compare at $8,830
IGISave 84.8%4.16ct | Radiant | E | VS2 | Very Good
From $979
Compare at $6,430
IGISave 63.2%4.16ct | Radiant | F | VS1 | Very Good
From $1,210
Compare at $3,285
IGI4.16ct | Radiant | E | VVS2 | Very Good
From $1,704
Compare at $1,719
IGISave 76.1%4.16ct | Radiant | D | VVS1 | Very Good
From $5,176
Compare at $21,682
IGISave 15.6%4.16ct | Radiant | F | VS1 | Very Good
From $1,065
Compare at $1,262
IGISave 58.7%4.16ct | Radiant | H | VS2 | Ideal
From $788
Compare at $1,909
IGISave 74.2%4.16ct | Radiant | D | VVS1 | Ideal
From $5,079
Compare at $19,700
GIASave 82%4.16ct | Radiant | D | VVS2 | Excellent
From $3,617
Compare at $20,100
GIASave 80.8%4.16ct | Radiant | D | IF | Excellent
From $10,559
Compare at $55,070
IGISave 38.2%4.16ct | Radiant | F | VVS2 | Ideal
From $1,842
Compare at $2,979
IGISave 82.2%4.16ct | Radiant | D | VVS1 | Excellent
From $4,429
Compare at $24,850
GIASave 71.2%4.17ct | Radiant | D | VVS2 | Excellent
From $5,775
Compare at $20,040
GCALSave 77.8%4.17ct | Radiant | D | IF | Excellent
From $12,709
Compare at $57,340
GIASave 58.5%4.17ct | Radiant | F | VS1 | Very Good
From $5,129
Compare at $12,370
IGISave 19.6%4.17ct | Radiant | D | VVS2 | Ideal
From $2,596
Compare at $3,230
IGISave 88.2%4.17ct | Radiant | E | VVS2 | Ideal
From $1,179
Compare at $9,970
GCALSave 75.8%4.17ct | Radiant | D | VVS2 | Excellent
From $6,100
Compare at $25,200
GIASave 68.8%4.17ct | Radiant | E | VS1 | Excellent
From $6,297
Compare at $20,170
GIASave 69%4.17ct | Radiant | E | VS2 | Ideal
From $5,755
Compare at $18,560
GIASave 63.5%4.17ct | Radiant | F | VVS2 | Excellent
From $3,360
Compare at $9,210
IGISave 84.6%4.17ct | Radiant | F | VS1 | Excellent
From $1,067
Compare at $6,920
IGISave 52.5%4.17ct | Radiant | D | VVS1 | Very Good
From $2,518
Compare at $5,303
IGISave 81.7%4.17ct | Radiant | F | VS1 | Ideal
From $1,232
Compare at $6,750
IGISave 81.5%4.17ct | Radiant | F | VS1 | Ideal
From $1,218
Compare at $6,580
IGISave 85.5%4.17ct | Radiant | D | IF | Ideal
From $8,903
Compare at $61,259
IGISave 76.9%4.17ct | Radiant | F | VS1 | Ideal
From $1,439
Compare at $6,230
IGISave 84.1%4.17ct | Radiant | F | VS2 | Very Good
From $937
Compare at $5,910
IGISave 81.6%4.17ct | Radiant | E | VVS1 | Ideal
From $2,557
Compare at $13,900
IGISave 19.1%4.17ct | Radiant | E | VS1 | Very Good
From $1,441
Compare at $1,780
IGISave 82%4.17ct | Radiant | D | VVS2 | Excellent
From $3,395
Compare at $18,810
IGISave 67.2%4.17ct | Radiant | D | VVS1 | Very Good
From $2,519
Compare at $7,670
IGISave 86.9%4.17ct | Radiant | F | VS2 | Very Good
From $937
Compare at $7,180
IGISave 66.8%4.17ct | Radiant | E | VVS2 | Ideal
From $3,414
Compare at $10,280
GIASave 67.2%4.18ct | Radiant | E | VVS1 | Excellent
From $3,759
Compare at $11,460
GIASave 65.1%4.18ct | Radiant | E | VVS2 | Ideal
From $3,562
Compare at $10,220
GIASave 77.9%4.18ct | Radiant | D | IF | Very Good
From $12,229
Compare at $55,330
IGISave 20.6%4.18ct | Radiant | H | VS1 | Ideal
From $944
Compare at $1,188
IGISave 77.1%4.18ct | Radiant | D | IF | Ideal
From $12,252
Compare at $53,420
GIASave 68.8%4.18ct | Radiant | E | VS1 | Excellent
From $6,312
Compare at $20,220
IGISave 60.4%4.18ct | Radiant | D | VVS1 | Ideal
From $5,341
Compare at $13,470
IGISave 74.8%4.18ct | Radiant | D | VVS1 | Ideal
From $5,356
Compare at $21,220
Entry pricing in this category starts around $788.
What to Know When Shopping for 4.2 Carat Radiant Lab Grown Diamonds
- Always compare identical certified diamonds across retailers. Identical certificate numbers can have price differences of $27,188 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 $2,557 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 171 comparable stones in this segment. Prices start around $788 and go up to $27,976.
Based on the latest market data, the average asking price is about $3,939 with a median around $2,557.
The observed spread is roughly $27,188 across tracked listings, which is about 97.2% 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 $2,557, 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 $27,188 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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