3 Carat Marquise Lab Grown Diamond Prices Comparison
As of October 2026, 3 carat marquise lab grown diamonds in the 3.00–3.49 carat benchmark range usually range from $388 to $23,175, with an average price of $1,984.In the last month, prices for these diamonds are down 2%.Compare 5,829 verified listings across 17 retailers tracked by CaratRadar.
3 Carat Marquise Lab Grown Diamond Market Overview
CaratRadar currently tracks 5,829 verified 3-carat marquise lab grown diamonds in the 3.00–3.49 carat benchmark range, listed across 17 online retailers. Prices in this segment range from $388 to $23,175, with an average asking price of $1,984 and a median of $1,390.
The price spread of $22,787 (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 use the same benchmark range throughout the page and 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.
5,829 diamonds tracked in the 3.00–3.49 carat benchmark
Price range: $388 to $23,175
Average price: $1,984
Median price: $1,390
Available across 17 retailers
Savings potential: up to 98.3%
Price Range Overview
As of Oct 14, 2026Real market range for this carat, shape, and diamond type.
5,829
$388
$1,984
$1,390
$23,175
Price History
Price Comparison Matrix
Live Listings
See all listingsCompare current retailer offers in the same benchmark range and open any listing for full details.
Save 73.3%IGI | 3.07ct | Marquise | G | VS1 | Ideal
From $471
Compare at $1,766
Save 73.3%IGI | 3.01ct | Marquise | G | VVS2 | Ideal
From $485
Compare at $1,817
Save 73.3%IGI | 3.03ct | Marquise | G | VS1 | Very Good
From $494
Compare at $1,850
Save 37%IGI | 3.06ct | Marquise | FANCY | SI1 | Very Good
From $504
Compare at $800
Save 49.8%IGI | 3.06ct | Marquise | F | SI1 | Ideal
From $513
Compare at $1,021
Save 74.6%IGI | 3.01ct | Marquise | H | VVS2 | Excellent
From $514
Compare at $2,021
Save 68.1%IGI | 3.01ct | Marquise | G | VS1 | Very Good
From $518
Compare at $1,622
Save 73.3%IGI | 3.01ct | Marquise | G | VVS2 | Ideal
From $525
Compare at $1,965
Save 73.3%IGI | 3.01ct | Marquise | G | VS1 | Very Good
From $525
Compare at $1,965
Save 49.3%IGI | 3.06ct | Marquise | G | VS1 | Ideal
From $528
Compare at $1,042
Save 37.2%IGI | 3.07ct | Marquise | FANCY | SI1 | Very Good
From $529
Compare at $842
Save 68.5%IGI | 3ct | Marquise | G | VVS2 | Very Good
From $538
Compare at $1,706
Save 52.7%IGI | 3.08ct | Marquise | G | VVS2 | Very Good
From $538
Compare at $1,137
IGI | 3.01ct | Marquise | G | SI2 | Very Good
From $542
Compare at $575
Save 73.3%IGI | 3.03ct | Marquise | G | VS1 | Very Good
From $545
Compare at $2,040
Save 49.2%IGI | 3.07ct | Marquise | FANCY | SI1 | Very Good
From $552
Compare at $1,087
Save 47.5%IGI | 3ct | Marquise | G | VVS2 | Excellent
From $552
Compare at $1,052
Save 47.8%IGI | 3.09ct | Marquise | G | VS1 | Excellent
From $553
Compare at $1,060
Save 73.3%IGI | 3.05ct | Marquise | E | VS2 | Ideal
From $560
Compare at $2,095
Save 45.2%IGI | 3ct | Marquise | G | VVS2 | Ideal
From $580
Compare at $1,058
Save 68.2%IGI | 3.04ct | Marquise | G | VVS2 | Excellent
From $580
Compare at $1,826
Save 77.3%IGI | 3ct | Marquise | F | VS1 | Ideal
From $585
Compare at $2,573
Save 63.9%IGI | 3.01ct | Marquise | G | VVS2 | Very Good
From $585
Compare at $1,622
Save 50.7%IGI | 3.01ct | Marquise | F | VS1 | Ideal
From $588
Compare at $1,193
Save 78.6%IGI | 3ct | Marquise | FANCY | VS2
From $596
Compare at $2,789
Save 71.5%IGI | 3.05ct | Marquise | F | VVS2 | Excellent
From $596
Compare at $2,094
Save 32.9%IGI | 3.03ct | Marquise | F | VVS2 | Ideal
From $598
Compare at $891
Save 48.9%IGI | 3ct | Marquise | F | VS1 | Very Good
From $599
Compare at $1,172
Save 32.8%IGI | 3ct | Marquise | F | VS1 | Ideal
From $599
Compare at $891
Save 73.3%IGI | 3.03ct | Marquise | D | VS2 | Excellent
From $602
Compare at $2,252
Save 32.8%IGI | 3.05ct | Marquise | F | VVS2 | Excellent
From $609
Compare at $906
Save 32.5%IGI | 3.01ct | Marquise | F | VVS2 | Ideal
From $614
Compare at $910
Save 50.3%IGI | 3.03ct | Marquise | G | VVS2 | Very Good
From $615
Compare at $1,237
Save 71.1%IGI | 3ct | Marquise | G | VS1 | Very Good
From $615
Compare at $2,131
Save 44.8%IGI | 3.01ct | Marquise | F | VS2 | Excellent
From $617
Compare at $1,117
Save 64.7%IGI | 3.01ct | Marquise | G | VVS2 | Very Good
From $620
Compare at $1,754
Save 73%IGI | 3.09ct | Marquise | H | VS1 | Excellent
From $622
Compare at $2,305
Save 75.5%IGI | 3.02ct | Marquise | F | VS1 | Ideal
From $622
Compare at $2,538
Save 31.9%IGI | 3.02ct | Marquise | F | VS1 | Very Good
From $623
Compare at $915
Save 42.4%IGI | 3ct | Marquise | G | VVS2 | Ideal
From $625
Compare at $1,086
Save 75.5%IGI | 3.03ct | Marquise | F | VS1 | Ideal
From $625
Compare at $2,546
Save 75.5%IGI | 3.03ct | Marquise | F | VS1 | Ideal
From $625
Compare at $2,546
Save 75.5%IGI | 3.04ct | Marquise | F | VS1 | Ideal
From $626
Compare at $2,555
Save 39.6%IGI | 3.01ct | Marquise | F | VVS2 | Ideal
From $626
Compare at $1,037
Save 39.5%IGI | 3.02ct | Marquise | F | VVS2 | Excellent
From $629
Compare at $1,040
Save 65.8%IGI | 3.06ct | Marquise | G | VS1 | Excellent
From $630
Compare at $1,844
Save 75.5%IGI | 3.03ct | Marquise | E | VS2 | Ideal
From $631
Compare at $2,573
Save 74.6%IGI | 3ct | Marquise | F | VS1 | Good
From $631
Compare at $2,489
Save 78.9%IGI | 3.06ct | Marquise | F | VS2 | Ideal
From $634
Compare at $3,010
Save 39.6%IGI | 3.05ct | Marquise | F | VVS2 | Excellent
From $635
Compare at $1,051
Entry pricing in this benchmark range starts around $388.
What to Know When Shopping for 3 Carat Marquise Lab Grown Diamonds
- Always compare identical certified diamonds across retailers. Identical certificate numbers can have price differences of $22,787 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 $1,390 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 5,829 comparable stones in the 3.00–3.49 carat benchmark range. Prices start around $388 and go up to $23,175.
Based on the latest market data, the average asking price is about $1,984 with a median around $1,390.
The observed spread is roughly $22,787 across tracked listings, which is about 98.3% from highest to lowest offer in the 3.00–3.49 carat benchmark range.
We refresh pricing data daily so these pages stay current with market changes.
Based on completed market data, the fair market benchmark is $1,984. The median price is $1,390, 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 17 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 $22,787 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.
Related Price Categories
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Tracking Lab Grown inventory for the 3.00–3.49 carat Marquise diamond benchmark.