4.2 Carat Round Lab Grown Diamond Prices Comparison
As of May 2026, 4.2 carat round lab grown diamonds usually range from $624 to $44,422, with an average price of $5,431.In the last month, prices for these diamonds are down 4.2%.Compare 245 verified listings across 9 retailers tracked by CaratRadar.
4.2 Carat Round Lab Grown Diamond Market Overview
CaratRadar currently tracks 245 verified 4.2-carat round lab grown diamonds listed across 9 online retailers. Prices in this segment range from $624 to $44,422, with an average asking price of $5,431 and a median of $3,800.
The price spread of $43,798 (98.6% 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.
245 diamonds tracked in this segment
Price range: $624 to $44,422
Average price: $5,431
Median price: $3,800
Available across 9 retailers
Savings potential: up to 98.6%
Price Range Overview
As of May 29, 2026Real market range for this carat, shape, and diamond type.
245
$624
$5,431
$3,801
$44,422
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 78.7%IGI | 4.25ct | Round | I | VS1 | Ideal
From $693
Compare at $3,260
Save 75.9%IGI | 4.26ct | Round | G | SI1 | Ideal
From $761
Compare at $3,160
Save 79.9%IGI | 4.23ct | Round | G | VS2 | Ideal
From $784
Compare at $3,910
Save 75%IGI | 4.21ct | Round | E | VS1 | Excellent
From $820
Compare at $3,280
Save 54.6%IGI | 4.28ct | Round | F | VS1 | Excellent
From $855
Compare at $1,885
Save 13.5%IGI | 4.27ct | Round | F | SI1 | Ideal
From $858
Compare at $992
Save 63.7%IGI | 4.23ct | Round | E | VS1 | Excellent
From $872
Compare at $2,403
Save 75.9%IGI | 4.22ct | Round | E | SI1 | Ideal
From $874
Compare at $3,620
Save 63.9%IGI | 4.26ct | Round | E | VS1 | Ideal
From $879
Compare at $2,436
Save 67%IGI | 4.27ct | Round | E | VVS2 | Ideal
From $887
Compare at $2,689
Save 70.5%IGI | 4.26ct | Round | G | VVS2 | Ideal
From $888
Compare at $3,009
Save 79.9%IGI | 4.22ct | Round | E | VVS2 | Excellent
From $899
Compare at $4,470
Save 72.5%IGI | 4.27ct | Round | H | VS2 | Ideal
From $916
Compare at $3,330
Save 50.9%IGI | 4.27ct | Round | F | VS1 | Excellent
From $921
Compare at $1,874
Save 62.7%IGI | 4.25ct | Round | F | VVS2 | Ideal
From $926
Compare at $2,483
Save 77.5%IGI | 4.28ct | Round | D | VS2 | Excellent
From $935
Compare at $4,150
Save 63%IGI | 4.29ct | Round | F | VVS2 | Ideal
From $935
Compare at $2,527
Save 63.8%IGI | 4.21ct | Round | E | VVS2 | Ideal
From $947
Compare at $2,615
Save 63.8%IGI | 4.21ct | Round | E | VVS2 | Ideal
From $947
Compare at $2,615
Save 66.6%IGI | 4.22ct | Round | E | VS1 | Ideal
From $952
Compare at $2,850
Save 62.5%IGI | 4.29ct | Round | F | VVS2 | Ideal
From $953
Compare at $2,543
Save 60.6%IGI | 4.26ct | Round | E | VVS2 | Excellent
From $958
Compare at $2,435
Save 63.8%IGI | 4.25ct | Round | E | VVS2 | Ideal
From $965
Compare at $2,663
IGI | 4.22ct | Round | H | VS1 | Ideal
From $990
Compare at $3,820
Save 52.1%IGI | 4.23ct | Round | G | VS2 | Excellent
From $1,020
Compare at $2,131
Save 59.7%IGI | 4.27ct | Round | F | VVS2 | Excellent
From $1,025
Compare at $2,546
IGI | 4.26ct | Round | H | VS1 | Ideal
From $1,033
Compare at $4,150
Save 75.1%IGI | 4.26ct | Round | D | VS1 | Excellent
From $1,040
Compare at $4,170
Save 79.7%IGI | 4.26ct | Round | E | VVS2 | Ideal
From $1,044
Compare at $5,140
Save 65.8%IGI | 4.25ct | Round | F | VS2 | Ideal
From $1,046
Compare at $3,060
Save 79.7%IGI | 4.28ct | Round | E | VVS2 | Excellent
From $1,049
Compare at $5,160
Save 74.8%IGI | 4.26ct | Round | D | VS1 | Excellent
From $1,050
Compare at $4,170
Save 74.8%IGI | 4.28ct | Round | D | VS1 | Excellent
From $1,055
Compare at $4,190
Save 74.8%IGI | 4.29ct | Round | D | VS1 | Excellent
From $1,057
Compare at $4,200
Save 74.8%IGI | 4.29ct | Round | D | VS1 | Excellent
From $1,057
Compare at $4,200
Save 74.8%IGI | 4.29ct | Round | D | VS1 | Excellent
From $1,057
Compare at $4,200
Save 13.4%IGI | 4.27ct | Round | E | VS1 | Ideal
From $1,058
Compare at $1,222
Save 63.9%IGI | 4.26ct | Round | F | VS2 | Excellent
From $1,061
Compare at $2,935
Save 42.2%IGI | 4.29ct | Round | G | VS1 | Excellent
From $1,062
Compare at $1,837
Save 63.2%IGI | 4.22ct | Round | G | VS1 | Ideal
From $1,065
Compare at $2,894
Save 54.1%IGI | 4.22ct | Round | F | VS1 | Excellent
From $1,077
Compare at $2,345
Save 13.5%IGI | 4.21ct | Round | F | VVS2 | Ideal
From $1,081
Compare at $1,250
Save 13.5%IGI | 4.24ct | Round | F | VVS2 | Ideal
From $1,089
Compare at $1,259
Save 71.5%IGI | 4.24ct | Round | F | SI1 | Ideal
From $1,099
Compare at $3,860
Save 45.5%IGI | 4.29ct | Round | G | VVS2 | Excellent
From $1,100
Compare at $2,017
Save 65.4%IGI | 4.25ct | Round | F | VS1 | Excellent
From $1,102
Compare at $3,185
Save 65.4%IGI | 4.25ct | Round | F | VS1 | Ideal
From $1,102
Compare at $3,185
Save 64%IGI | 4.26ct | Round | F | VS1 | Excellent
From $1,104
Compare at $3,065
Save 65.4%IGI | 4.26ct | Round | F | VS1 | Ideal
From $1,104
Compare at $3,195
Save 65.4%IGI | 4.26ct | Round | F | VS1 | Excellent
From $1,104
Compare at $3,195
Entry pricing in this category starts around $624.
What to Know When Shopping for 4.2 Carat Round Lab Grown Diamonds
- Always compare identical certified diamonds across retailers. Identical certificate numbers can have price differences of $43,798 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 $3,800 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 245 comparable stones in this segment. Prices start around $624 and go up to $44,422.
Based on the latest market data, the average asking price is about $5,431 with a median around $3,800.
The observed spread is roughly $43,798 across tracked listings, which is about 98.6% 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 $5,431. The median price is $3,800, 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 $43,798 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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