4.2 Carat Radiant Lab Grown Diamond Prices Comparison
As of April 2026, 4.2 carat radiant lab grown diamonds usually range from $733 to $48,793, with an average price of $5,697.In the last month, prices for these diamonds are down 10.1%.Compare 282 verified listings across 9 retailers tracked by CaratRadar.
4.2 Carat Radiant Lab Grown Diamond Market Overview
CaratRadar currently tracks 282 verified 4.2-carat radiant lab grown diamonds listed across 9 online retailers. Prices in this segment range from $733 to $48,793, with an average asking price of $5,697 and a median of $4,016.
The price spread of $48,060 (98.5% 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.
282 diamonds tracked in this segment
Price range: $733 to $48,793
Average price: $5,697
Median price: $4,016
Available across 9 retailers
Savings potential: up to 98.5%
Price Range Overview
As of Apr 14, 2026Real market range for this carat, shape, and diamond type.
282
$733
$5,697
$4,016
$48,793
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 77.9%GCAL | 4.21ct | Radiant | E | VS1 | Excellent
From $1,975
Compare at $8,930
Save 76.9%GIA | 4.21ct | Radiant | E | VVS1 | Excellent
From $6,220
Compare at $26,910
GIA | 4.21ct | Radiant | E | VVS2 | Ideal
From $10,300
Save 66.8%GIA | 4.21ct | Radiant | E | VS1 | Ideal
From $5,186
Compare at $15,610
Save 76.3%GIA | 4.21ct | Radiant | E | VS1 | Ideal
From $2,609
Compare at $11,030
Save 59%GIA | 4.21ct | Radiant | F | VS1 | Excellent
From $3,650
Compare at $8,910
Save 59.9%IGI | 4.21ct | Radiant | H | VS1 | Excellent
From $1,385
Compare at $3,450
Save 81.8%IGI | 4.21ct | Radiant | G | SI1 | Very Good
From $1,065
Compare at $5,840
Save 72.8%IGI | 4.21ct | Radiant | D | VVS2 | Ideal
From $2,136
Compare at $7,850
Save 72.4%IGI | 4.21ct | Radiant | D | VVS1 | Excellent
From $3,755
Compare at $13,610
Save 71.3%IGI | 4.21ct | Radiant | F | VS2 | Ideal
From $1,368
Compare at $4,770
Save 86.2%IGI | 4.21ct | Radiant | F | VVS2 | Ideal
From $1,228
Compare at $8,930
Save 65.5%IGI | 4.21ct | Radiant | E | VVS2 | Ideal
From $2,880
Compare at $8,359
Save 73.8%IGI | 4.21ct | Radiant | D | VVS1 | Excellent
From $3,571
Compare at $13,610
IGI | 4.21ct | Radiant | E | VS2 | Very Good
From $2,063
Compare at $2,065
Save 27.4%IGI | 4.21ct | Radiant | E | VS1 | Ideal
From $1,765
Compare at $2,432
Save 70.6%IGI | 4.21ct | Radiant | D | FL | Ideal
From $13,430
Compare at $45,680
Save 73.5%IGI | 4.21ct | Radiant | G | VVS2 | Ideal
From $1,303
Compare at $4,920
Save 12.3%IGI | 4.21ct | Radiant | E | VS1 | Excellent
From $6,147
Compare at $7,010
Save 84%IGI | 4.21ct | Radiant | E | VS1 | Very Good
From $970
Compare at $6,050
Save 77.3%IGI | 4.21ct | Radiant | E | VVS2 | Very Good
From $1,328
Compare at $5,840
Save 42.7%IGI | 4.21ct | Radiant | D | VVS2 | Very Good
From $1,735
Compare at $3,029
Save 70.2%IGI | 4.21ct | Radiant | D | VS1 | Very Good
From $1,277
Compare at $4,290
Save 69.9%IGI | 4.21ct | Radiant | E | VVS2 | Very Good
From $1,341
Compare at $4,460
Save 30.3%IGI | 4.21ct | Radiant | E | VVS2 | Very Good
From $1,341
Compare at $1,925
Save 30.3%IGI | 4.21ct | Radiant | E | VVS2 | Very Good
From $1,341
Compare at $1,925
Save 55.9%IGI | 4.21ct | Radiant | F | VVS2 | Very Good
From $910
Compare at $2,064
Save 30.4%IGI | 4.21ct | Radiant | D | VS1 | Very Good
From $1,264
Compare at $1,815
IGI | 4.21ct | Radiant | E | VVS2 | Very Good
From $985
Compare at $1,752
Save 84.4%IGI | 4.21ct | Radiant | E | VVS2 | Very Good
From $1,577
Compare at $10,130
GIA | 4.22ct | Radiant | E | VVS2 | Ideal
From $10,320
Save 76.9%GIA | 4.22ct | Radiant | D | VVS1 | Excellent
From $6,230
Compare at $27,010
Save 69.8%IGI | 4.22ct | Radiant | G | VS2 | Excellent
From $1,163
Compare at $3,850
Save 74.1%IGI | 4.22ct | Radiant | F | VS2 | Ideal
From $1,910
Compare at $7,380
Save 74.4%IGI | 4.22ct | Radiant | D | VVS2 | Ideal
From $2,141
Compare at $8,360
Save 72.2%IGI | 4.22ct | Radiant | E | VS1 | Very Good
From $1,563
Compare at $5,620
Save 86.2%IGI | 4.22ct | Radiant | G | VVS2 | Ideal
From $1,095
Compare at $7,930
Save 84.9%IGI | 4.22ct | Radiant | F | VVS2 | Ideal
From $1,352
Compare at $8,950
Save 77.9%IGI | 4.22ct | Radiant | D | IF | Ideal
From $7,270
Compare at $32,830
Save 77.9%IGI | 4.22ct | Radiant | D | IF | Very Good
From $7,270
Compare at $32,830
Save 76.3%IGI | 4.22ct | Radiant | E | VVS2 | Ideal
From $2,102
Compare at $8,850
IGI | 4.22ct | Radiant | E | VVS2 | Excellent
From $7,047
Compare at $7,490
Save 72.8%IGI | 4.22ct | Radiant | E | IF | Ideal
From $4,355
Compare at $16,020
Save 44%IGI | 4.22ct | Radiant | D | IF | Excellent
From $7,585
Compare at $13,543
Save 78.1%IGI | 4.22ct | Radiant | D | VVS1 | Very Good
From $3,008
Compare at $13,720
Save 76.9%IGI | 4.22ct | Radiant | E | VS1 | Very Good
From $1,518
Compare at $6,570
Save 78.9%IGI | 4.22ct | Radiant | E | VVS2 | Ideal
From $1,332
Compare at $6,300
Save 83.6%IGI | 4.22ct | Radiant | F | VS1 | Ideal
From $1,370
Compare at $8,350
Save 84%IGI | 4.22ct | Radiant | E | VS1 | Ideal
From $970
Compare at $6,070
Save 70.2%IGI | 4.22ct | Radiant | E | VVS2 | Very Good
From $1,332
Compare at $4,470
Entry pricing in this category starts around $733.
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 $48,060 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 $4,016 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 282 comparable stones in this segment. Prices start around $733 and go up to $48,793.
Based on the latest market data, the average asking price is about $5,697 with a median around $4,016.
The observed spread is roughly $48,060 across tracked listings, which is about 98.5% 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 $4,016, 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 $48,060 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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