1.8 Carat Marquise Lab Grown Diamond Prices Comparison
As of April 2026, 1.8 carat marquise lab grown diamonds usually range from $407 to $5,670, with an average price of $1,314.In the last month, prices for these diamonds are up 0.7%.Compare 967 verified listings across 8 retailers tracked by CaratRadar.
1.8 Carat Marquise Lab Grown Diamond Market Overview
CaratRadar currently tracks 967 verified 1.8-carat marquise lab grown diamonds listed across 8 online retailers. Prices in this segment range from $407 to $5,670, with an average asking price of $1,314 and a median of $1,082.
The price spread of $5,263 (92.8% 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.
967 diamonds tracked in this segment
Price range: $407 to $5,670
Average price: $1,314
Median price: $1,082
Available across 8 retailers
Savings potential: up to 92.8%
Price Range Overview
As of Apr 14, 2026Real market range for this carat, shape, and diamond type.
967
$407
$1,314
$1,083
$5,670
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 54.2%IGI | 1.81ct | Marquise | E | IF | Ideal
From $1,817
Compare at $3,964
Save 73.4%IGI | 1.81ct | Marquise | F | VVS2 | Excellent
From $736
Compare at $2,770
Save 55.8%IGI | 1.81ct | Marquise | F | VVS1 | Excellent
From $681
Compare at $1,542
Save 53.8%IGI | 1.81ct | Marquise | F | VS1 | Excellent
From $635
Compare at $1,375
Save 59.1%IGI | 1.81ct | Marquise | F | VVS2 | Ideal
From $659
Compare at $1,610
Save 75%IGI | 1.81ct | Marquise | E | VS1 | Very Good
From $1,926
Compare at $7,691
Save 58.6%IGI | 1.81ct | Marquise | F | VVS2 | Ideal
From $666
Compare at $1,610
Save 60.1%IGI | 1.81ct | Marquise | E | VS2 | Very Good
From $695
Compare at $1,740
Save 57.1%IGI | 1.81ct | Marquise | F | VVS2 | Excellent
From $659
Compare at $1,535
Save 57.1%IGI | 1.81ct | Marquise | F | VVS2 | Excellent
From $659
Compare at $1,535
Save 74.5%IGI | 1.81ct | Marquise | E | VVS2 | Excellent
From $1,083
Compare at $4,250
Save 76.7%IGI | 1.81ct | Marquise | F | VVS2 | Excellent
From $1,006
Compare at $4,320
Save 73%IGI | 1.81ct | Marquise | D | VVS2 | Excellent
From $1,100
Compare at $4,070
Save 50.2%IGI | 1.81ct | Marquise | F | VS1 | Ideal
From $684
Compare at $1,375
Save 76.3%IGI | 1.81ct | Marquise | E | VS2 | Ideal
From $630
Compare at $2,660
Save 55.4%IGI | 1.81ct | Marquise | E | VS1 | Excellent
From $645
Compare at $1,445
Save 70.8%IGI | 1.81ct | Marquise | D | VVS1 | Ideal
From $1,054
Compare at $3,610
Save 76%IGI | 1.81ct | Marquise | E | VS1 | Very Good
From $695
Compare at $2,900
Save 15.6%IGI | 1.81ct | Marquise | E | VS1 | Excellent
From $631
Compare at $747
Save 80.3%IGI | 1.81ct | Marquise | E | VVS2 | Excellent
From $630
Compare at $3,200
Save 54.1%IGI | 1.81ct | Marquise | F | VS1 | Ideal
From $631
Compare at $1,375
Save 41.9%IGI | 1.81ct | Marquise | G | VS1 | Very Good
From $475
Compare at $817
Save 65.5%IGI | 1.81ct | Marquise | E | VS2 | Ideal
From $631
Compare at $1,830
Save 52.2%IGI | 1.81ct | Marquise | F | VS1 | Very Good
From $631
Compare at $1,320
Save 74.2%IGI | 1.81ct | Marquise | E | VVS2 | Very Good
From $832
Compare at $3,230
Save 55.9%IGI | 1.81ct | Marquise | E | VS1 | Very Good
From $638
Compare at $1,445
Save 62.7%IGI | 1.81ct | Marquise | F | VVS2 | Very Good
From $709
Compare at $1,900
Save 77.5%IGI | 1.81ct | Marquise | D | VVS2 | Very Good
From $819
Compare at $3,630
Save 59.9%IGI | 1.81ct | Marquise | E | VVS2 | Excellent
From $673
Compare at $1,680
Save 73.1%IGI | 1.81ct | Marquise | D | VS1 | Very Good
From $1,025
Compare at $3,810
Save 65.1%IGI | 1.81ct | Marquise | F | VS2 | Ideal
From $607
Compare at $1,740
Save 66.6%IGI | 1.81ct | Marquise | F | VS2 | Ideal
From $607
Compare at $1,820
Save 48.1%IGI | 1.81ct | Marquise | F | VS1 | Excellent
From $684
Compare at $1,320
Save 59.9%IGI | 1.81ct | Marquise | E | VVS2 | Excellent
From $673
Compare at $1,680
Save 67.1%IGI | 1.81ct | Marquise | D | VS2 | Ideal
From $645
Compare at $1,960
Save 58.1%IGI | 1.81ct | Marquise | D | VS2 | Ideal
From $652
Compare at $1,555
Save 57.5%IGI | 1.81ct | Marquise | E | VS1 | Ideal
From $638
Compare at $1,500
Save 68.7%IGI | 1.81ct | Marquise | F | VS1 | Very Good
From $757
Compare at $2,420
Save 68.9%IGI | 1.81ct | Marquise | F | VS1 | Very Good
From $688
Compare at $2,210
Save 59.5%IGI | 1.81ct | Marquise | E | VVS2 | Excellent
From $680
Compare at $1,680
Save 65.7%IGI | 1.81ct | Marquise | D | VS2 | Ideal
From $645
Compare at $1,880
Save 56.3%IGI | 1.81ct | Marquise | E | VS1 | Excellent
From $631
Compare at $1,445
Save 64%IGI | 1.81ct | Marquise | E | VS2 | Excellent
From $631
Compare at $1,750
Save 75.2%IGI | 1.81ct | Marquise | E | VS1 | Excellent
From $718
Compare at $2,900
Save 61.7%IGI | 1.81ct | Marquise | E | VVS2 | Excellent
From $673
Compare at $1,755
Save 82.6%IGI | 1.81ct | Marquise | D | VVS2 | Excellent
From $710
Compare at $4,070
Save 72.2%IGI | 1.81ct | Marquise | D | VVS2 | Very Good
From $870
Compare at $3,130
Save 55.9%IGI | 1.81ct | Marquise | E | VS1 | Excellent
From $638
Compare at $1,445
Save 64.6%IGI | 1.81ct | Marquise | E | VVS2 | Ideal
From $1,131
Compare at $3,200
Save 65.8%IGI | 1.81ct | Marquise | E | VVS2 | Ideal
From $729
Compare at $2,130
Entry pricing in this category starts around $407.
What to Know When Shopping for 1.8 Carat Marquise Lab Grown Diamonds
- Always compare identical certified diamonds across retailers. Identical certificate numbers can have price differences of $5,263 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 $1,082 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 967 comparable stones in this segment. Prices start around $407 and go up to $5,670.
Based on the latest market data, the average asking price is about $1,314 with a median around $1,082.
The observed spread is roughly $5,263 across tracked listings, which is about 92.8% 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 $1,082, 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 $5,263 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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