4.2 Carat Marquise Lab Grown Diamond Prices Comparison
As of February 2026, 4.2 carat marquise lab grown diamonds usually range from $774 to $32,630, with an average price of $3,173.In the last month, prices for these diamonds are down 1.7%.Compare 44 verified listings across 8 retailers tracked by CaratRadar.
4.2 Carat Marquise Lab Grown Diamond Market Overview
CaratRadar currently tracks 44 verified 4.2-carat marquise lab grown diamonds listed across 8 online retailers. Prices in this segment range from $774 to $32,630, with an average asking price of $3,173 and a median of $1,480.
The price spread of $31,857 (97.6% 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.
44 diamonds tracked in this segment
Price range: $774 to $32,630
Average price: $3,173
Median price: $1,480
Available across 8 retailers
Savings potential: up to 97.6%
Price Range Overview
As of Feb 28, 2026Real market range for this carat, shape, and diamond type.
44
$774
$3,173
$1,480
$32,630
Price History
Price Comparison Matrix
Live Listings
See all listingsCompare current retailer offers for this exact segment and open any listing for full details.
IGISave 17.9%4.16ct | Marquise | F | VS1 | Very Good
From $1,057
Compare at $1,288
IGISave 77.5%4.16ct | Marquise | E | VS1 | Excellent
From $1,860
Compare at $8,250
IGISave 81.3%4.16ct | Marquise | E | VS2 | Very Good
From $1,484
Compare at $7,940
IGISave 52.5%4.16ct | Marquise | H | VVS2 | Ideal
From $1,027
Compare at $2,162
IGISave 88.3%4.16ct | Marquise | E | VS1 | Excellent
From $1,143
Compare at $9,790
IGISave 51.7%4.17ct | Marquise | H | VS1 | Ideal
From $898
Compare at $1,858
IGISave 80.2%4.17ct | Marquise | F | VS2 | Ideal
From $1,422
Compare at $7,180
IGISave 66.4%4.17ct | Marquise | E | VVS1 | Ideal
From $3,889
Compare at $11,570
IGISave 81.4%4.17ct | Marquise | G | VS2 | Ideal
From $956
Compare at $5,140
IGISave 80.6%4.18ct | Marquise | G | VS1 | Very Good
From $1,128
Compare at $5,820
IGISave 58.5%4.18ct | Marquise | H | VS1 | Ideal
From $774
Compare at $1,863
IGISave 58.8%4.18ct | Marquise | H | VS1 | Ideal
From $791
Compare at $1,919
IGISave 64%4.18ct | Marquise | E | VS1 | Excellent
From $1,269
Compare at $3,527
IGISave 83.5%4.18ct | Marquise | E | VVS2 | Ideal
From $1,651
Compare at $10,000
GIA4.18ct | Marquise | D | FL | Excellent
From $32,630
Compare at $33,700
IGISave 83.1%4.18ct | Marquise | G | VS1 | Ideal
From $944
Compare at $5,570
IGISave 37.3%4.19ct | Marquise | E | VVS2 | Excellent
From $6,285
Compare at $10,020
IGISave 33.5%4.19ct | Marquise | E | VVS2 | Ideal
From $6,662
Compare at $10,020
IGISave 70.2%4.2ct | Marquise | D | VVS2 | Excellent
From $3,504
Compare at $11,770
IGISave 36%4.2ct | Marquise | F | VVS2 | Excellent
From $2,173
Compare at $3,398
IGISave 87.4%4.2ct | Marquise | E | VS2 | Very Good
From $1,014
Compare at $8,020
IGISave 22.1%4.2ct | Marquise | F | VVS2 | Very Good
From $2,349
Compare at $3,014
IGISave 86%4.2ct | Marquise | F | VVS2 | Excellent
From $1,264
Compare at $9,000
IGISave 48.5%4.2ct | Marquise | H | VS1 | Ideal
From $948
Compare at $1,843
IGISave 49.2%4.2ct | Marquise | H | VVS2 | Ideal
From $1,066
Compare at $2,098
IGISave 81.7%4.21ct | Marquise | F | VVS2 | Ideal
From $1,963
Compare at $10,700
IGISave 27.9%4.21ct | Marquise | E | VS1 | Ideal
From $6,315
Compare at $8,760
IGISave 63.9%4.21ct | Marquise | E | VVS1 | Very Good
From $4,221
Compare at $11,680
IGISave 56%4.21ct | Marquise | E | VS1 | Very Good
From $1,477
Compare at $3,355
IGISave 81.8%4.22ct | Marquise | E | VS1 | Ideal
From $1,819
Compare at $10,000
IGISave 57.2%4.22ct | Marquise | G | VS2 | Ideal
From $1,130
Compare at $2,644
IGISave 48.5%4.23ct | Marquise | H | VS1 | Ideal
From $955
Compare at $1,856
GIASave 21.6%4.23ct | Marquise | H | VVS2 | Ideal
From $6,630
Compare at $8,460
IGISave 18.6%4.23ct | Marquise | E | VVS2 | Excellent
From $6,726
Compare at $8,260
IGISave 81.9%4.23ct | Marquise | F | VS1 | Very Good
From $1,508
Compare at $8,320
IGISave 87.8%4.23ct | Marquise | F | VVS2 | Ideal
From $1,113
Compare at $9,100
IGISave 78.5%4.23ct | Marquise | G | VS2 | Ideal
From $921
Compare at $4,290
IGISave 48.6%4.24ct | Marquise | H | VS1 | Ideal
From $942
Compare at $1,832
IGISave 49.4%4.24ct | Marquise | H | VS1 | Ideal
From $942
Compare at $1,861
GIASave 74.6%4.24ct | Marquise | D | VVS2 | Excellent
From $4,831
Compare at $19,043
IGISave 59.8%4.24ct | Marquise | E | VVS1 | Ideal
From $4,709
Compare at $11,710
IGISave 66.5%4.24ct | Marquise | F | VS1 | Ideal
From $2,817
Compare at $8,410
IGISave 69.3%4.24ct | Marquise | E | VVS1 | Very Good
From $4,140
Compare at $13,470
IGISave 18.3%4.24ct | Marquise | E | VVS2 | Ideal
From $8,280
Compare at $10,140
Entry pricing in this category starts around $774.
What to Know When Shopping for 4.2 Carat Marquise Lab Grown Diamonds
- Always compare identical certified diamonds across retailers. Identical certificate numbers can have price differences of $31,857 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 $1,480 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.
- Marquise diamonds maximize carat weight face-up and appear larger than their actual weight. Check symmetry carefully.
Frequently Asked Questions
We currently track 44 comparable stones in this segment. Prices start around $774 and go up to $32,630.
Based on the latest market data, the average asking price is about $3,173 with a median around $1,480.
The observed spread is roughly $31,857 across tracked listings, which is about 97.6% 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 $1,480, 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 $31,857 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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