4.2 Carat Radiant Lab Grown Diamond Prices Comparison
As of May 2026, 4.2 carat radiant lab grown diamonds usually range from $696 to $41,929, with an average price of $4,819.In the last month, prices for these diamonds are down 9.1%.Compare 128 verified listings across 9 retailers tracked by CaratRadar.
4.2 Carat Radiant Lab Grown Diamond Market Overview
CaratRadar currently tracks 128 verified 4.2-carat radiant lab grown diamonds listed across 9 online retailers. Prices in this segment range from $696 to $41,929, with an average asking price of $4,819 and a median of $3,195.
The price spread of $41,233 (98.3% 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.
128 diamonds tracked in this segment
Price range: $696 to $41,929
Average price: $4,819
Median price: $3,195
Available across 9 retailers
Savings potential: up to 98.3%
Price Range Overview
As of May 29, 2026Real market range for this carat, shape, and diamond type.
128
$696
$4,819
$3,195
$41,929
Price History
Price Comparison Matrix
Live Listings
See all listingsCompare current retailer offers for this exact segment and open any listing for full details.
IGI | 4.24ct | Radiant | H | VS1 | Ideal
From $808
Compare at $3,470
Save 79.4%IGI | 4.28ct | Radiant | G | VS1 | Ideal
From $870
Compare at $4,220
Save 65.1%IGI | 4.25ct | Radiant | E | VVS2 | Very Good
From $874
Compare at $2,507
Save 56.8%IGI | 4.24ct | Radiant | G | VS1 | Very Good
From $882
Compare at $2,043
Save 65.7%IGI | 4.26ct | Radiant | E | VVS2 | Very Good
From $891
Compare at $2,597
Save 65.3%IGI | 4.23ct | Radiant | D | VS1 | Ideal
From $897
Compare at $2,582
Save 75.3%IGI | 4.22ct | Radiant | G | VS2 | Excellent
From $952
Compare at $3,850
Save 51.1%IGI | 4.24ct | Radiant | I | VS1 | Ideal
From $958
Compare at $1,958
Save 46.1%IGI | 4.24ct | Radiant | H | VS1 | Excellent
From $965
Compare at $1,789
Save 45.4%IGI | 4.25ct | Radiant | H | VS1 | Excellent
From $982
Compare at $1,799
Save 58.7%IGI | 4.27ct | Radiant | E | VS1 | Very Good
From $1,006
Compare at $2,433
Save 47.4%IGI | 4.21ct | Radiant | E | VS1 | Very Good
From $1,008
Compare at $1,916
Save 60.8%IGI | 4.24ct | Radiant | E | VVS2 | Very Good
From $1,008
Compare at $2,574
Save 57.5%IGI | 4.24ct | Radiant | E | VS1 | Very Good
From $1,023
Compare at $2,407
Save 57.7%IGI | 4.26ct | Radiant | E | VS1 | Very Good
From $1,030
Compare at $2,433
Save 51.4%IGI | 4.21ct | Radiant | E | VS2 | Very Good
From $1,039
Compare at $2,139
Save 57.1%IGI | 4.29ct | Radiant | E | VS1 | Very Good
From $1,057
Compare at $2,466
Save 56.9%IGI | 4.24ct | Radiant | E | VVS2 | Ideal
From $1,105
Compare at $2,561
Save 57%IGI | 4.27ct | Radiant | E | VVS2 | Very Good
From $1,115
Compare at $2,594
Save 66.4%IGI | 4.28ct | Radiant | D | VVS2 | Excellent
From $1,119
Compare at $3,329
Save 55.8%IGI | 4.21ct | Radiant | E | VVS2 | Very Good
From $1,119
Compare at $2,529
Save 56.4%IGI | 4.25ct | Radiant | E | VVS2 | Ideal
From $1,121
Compare at $2,572
Save 53.6%IGI | 4.21ct | Radiant | E | VS1 | Ideal
From $1,147
Compare at $2,471
Save 14.4%IGI | 4.26ct | Radiant | E | VVS2 | Ideal
From $1,161
Compare at $1,357
Save 72.9%IGI | 4.26ct | Radiant | FANCY | VVS2 | Very Good
From $1,215
Compare at $4,478
Save 34.5%IGI | 4.22ct | Radiant | F | VS2 | Ideal
From $1,251
Compare at $1,910
Save 36.5%IGI | 4.26ct | Radiant | H | VS1 | Excellent
From $1,290
Compare at $2,030
Save 72.9%IGI | 4.28ct | Radiant | F | VVS1 | Ideal
From $1,319
Compare at $4,867
Save 42.8%IGI | 4.21ct | Radiant | F | VVS2 | Very Good
From $1,321
Compare at $2,310
Save 79.9%IGI | 4.26ct | Radiant | H | VVS2 | Excellent
From $1,337
Compare at $6,660
Save 45.3%IGI | 4.23ct | Radiant | E | VS1 | Ideal
From $1,355
Compare at $2,476
Save 58.7%IGI | 4.21ct | Radiant | D | VVS2 | Ideal
From $1,357
Compare at $3,285
Save 41.6%IGI | 4.29ct | Radiant | F | VVS2 | Very Good
From $1,367
Compare at $2,340
Save 46.8%IGI | 4.27ct | Radiant | E | VS1 | Excellent
From $1,368
Compare at $2,570
Save 46.5%IGI | 4.21ct | Radiant | E | VVS2 | Very Good
From $1,386
Compare at $2,593
Save 78.8%IGI | 4.21ct | Radiant | F | VS2 | Excellent
From $1,396
Compare at $6,571
Save 47.9%IGI | 4.29ct | Radiant | E | VVS2 | Very Good
From $1,403
Compare at $2,692
Save 39.3%IGI | 4.27ct | Radiant | F | VVS2 | Very Good
From $1,426
Compare at $2,348
Save 79%IGI | 4.21ct | Radiant | E | VVS1 | Excellent
From $1,426
Compare at $6,806
Save 45.6%IGI | 4.21ct | Radiant | E | VVS2 | Excellent
From $1,431
Compare at $2,631
Save 45.9%IGI | 4.24ct | Radiant | E | VVS2 | Excellent
From $1,442
Compare at $2,666
Save 46.2%IGI | 4.26ct | Radiant | E | VVS2 | Excellent
From $1,448
Compare at $2,689
Save 46.2%IGI | 4.27ct | Radiant | E | VVS2 | Excellent
From $1,452
Compare at $2,701
Save 46.4%IGI | 4.29ct | Radiant | E | VVS2 | Excellent
From $1,459
Compare at $2,724
Save 53.5%IGI | 4.28ct | Radiant | D | VVS2 | Excellent
From $1,580
Compare at $3,397
Save 56.1%GIA | 4.26ct | Radiant | F | SI1 | Very Good
From $1,584
Compare at $3,610
Save 79.8%GIA | 4.21ct | Radiant | F | VS1 | Excellent
From $1,798
Compare at $8,910
Save 54%GIA | 4.23ct | Radiant | G | VVS2 | Very Good
From $1,835
Compare at $3,988
IGI | 4.25ct | Radiant | G | VS1 | Very Good
From $1,935
Compare at $2,129
Save 77.9%GCAL | 4.21ct | Radiant | E | VS1 | Excellent
From $1,975
Compare at $8,930
Entry pricing in this category starts around $696.
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 $41,233 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 $3,195 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 128 comparable stones in this segment. Prices start around $696 and go up to $41,929.
Based on the latest market data, the average asking price is about $4,819 with a median around $3,195.
The observed spread is roughly $41,233 across tracked listings, which is about 98.3% from highest to lowest offer in this bucket.
We refresh pricing data daily so these pages stay current with market changes.
Based on completed market data, the fair market benchmark is $4,819. The median price is $3,195, so offers between the median and fair benchmark can be reasonable, while reputable listings below the median may be especially competitive.
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 $41,233 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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