1.8 Carat Marquise Lab Grown Diamond Prices Comparison
As of February 2026, 1.8 carat marquise lab grown diamonds usually range from $479 to $4,924, with an average price of $860.In the last month, prices for these diamonds are down 0.2%.Compare 517 verified listings across 7 retailers tracked by CaratRadar.
1.8 Carat Marquise Lab Grown Diamond Market Overview
CaratRadar currently tracks 517 verified 1.8-carat marquise lab grown diamonds listed across 7 online retailers. Prices in this segment range from $479 to $4,924, with an average asking price of $860 and a median of $709.
The price spread of $4,445 (90.3% 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 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.
517 diamonds tracked in this segment
Price range: $479 to $4,924
Average price: $860
Median price: $709
Available across 7 retailers
Savings potential: up to 90.3%
Price Range Overview
As of Feb 28, 2026Real market range for this carat, shape, and diamond type.
517
$479
$860
$709
$4,924
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 27.8%1.75ct | Marquise | E | VS2 | Very Good
From $954
Compare at $1,321
GIASave 38.9%1.75ct | Marquise | G | VVS2 | Very Good
From $1,778
Compare at $2,910
IGISave 56.4%1.75ct | Marquise | E | IF | Ideal
From $1,901
Compare at $4,360
IGISave 77.3%1.75ct | Marquise | G | IF | Ideal
From $1,882
Compare at $8,280
IGISave 60.1%1.75ct | Marquise | F | VVS2 | Excellent
From $599
Compare at $1,501
IGISave 66.7%1.75ct | Marquise | F | VVS2 | Ideal
From $672
Compare at $2,020
IGISave 50.8%1.75ct | Marquise | E | VVS2 | Ideal
From $834
Compare at $1,695
IGISave 43.3%1.75ct | Marquise | E | VS1 | Excellent
From $794
Compare at $1,400
IGISave 64.6%1.75ct | Marquise | F | VVS2 | Ideal
From $900
Compare at $2,540
IGISave 63.5%1.75ct | Marquise | D | VVS2 | Ideal
From $1,018
Compare at $2,793
IGISave 49.7%1.75ct | Marquise | D | VS2 | Ideal
From $1,505
Compare at $2,990
IGISave 69.5%1.75ct | Marquise | D | VVS1 | Very Good
From $1,340
Compare at $4,400
IGISave 37%1.75ct | Marquise | E | VVS2 | Excellent
From $755
Compare at $1,199
IGISave 64.4%1.75ct | Marquise | D | VVS2 | Ideal
From $1,244
Compare at $3,490
1.75ct | Marquise | E | VS1 | Very Good
From $840
Compare at $2,381
IGISave 75.8%1.75ct | Marquise | E | VVS2 | Ideal
From $816
Compare at $3,370
IGISave 70.8%1.75ct | Marquise | D | VVS2 | Ideal
From $770
Compare at $2,640
IGISave 75.5%1.75ct | Marquise | D | VVS2 | Excellent
From $739
Compare at $3,010
IGISave 49.6%1.75ct | Marquise | E | VVS1 | Very Good
From $742
Compare at $1,471
IGISave 41.6%1.75ct | Marquise | D | VVS2 | Very Good
From $913
Compare at $1,563
IGISave 31.8%1.75ct | Marquise | F | VVS2 | Very Good
From $882
Compare at $1,292
IGISave 74.7%1.75ct | Marquise | E | VS1 | Excellent
From $625
Compare at $2,470
IGISave 63%1.75ct | Marquise | E | VS1 | Ideal
From $609
Compare at $1,647
IGISave 73.4%1.75ct | Marquise | D | VS1 | Very Good
From $855
Compare at $3,210
IGISave 56.5%1.75ct | Marquise | E | VS2 | Very Good
From $813
Compare at $1,870
IGISave 78.7%1.75ct | Marquise | E | VVS2 | Very Good
From $719
Compare at $3,370
IGISave 54.2%1.75ct | Marquise | E | VS1 | Ideal
From $664
Compare at $1,450
IGISave 58%1.75ct | Marquise | E | VVS2 | Ideal
From $712
Compare at $1,695
IGISave 54%1.75ct | Marquise | E | VS1 | Excellent
From $644
Compare at $1,400
IGISave 65.8%1.75ct | Marquise | D | VS1 | Ideal
From $1,067
Compare at $3,120
IGISave 75.7%1.75ct | Marquise | F | VVS2 | Ideal
From $725
Compare at $2,990
IGISave 69.3%1.75ct | Marquise | E | VS1 | Ideal
From $672
Compare at $2,190
IGISave 79.4%1.76ct | Marquise | E | SI1 | Ideal
From $509
Compare at $2,470
IGISave 69.4%1.76ct | Marquise | E | VS2 | Ideal
From $910
Compare at $2,970
IGISave 78.7%1.76ct | Marquise | D | VS2 | Excellent
From $641
Compare at $3,010
IGISave 69.6%1.76ct | Marquise | D | IF | Excellent
From $2,636
Compare at $8,659
IGISave 64.7%1.76ct | Marquise | D | IF | Excellent
From $2,117
Compare at $6,000
IGISave 50.6%1.76ct | Marquise | E | VS1 | Very Good
From $729
Compare at $1,477
IGISave 58.5%1.76ct | Marquise | F | VVS2 | Excellent
From $666
Compare at $1,604
IGISave 30.5%1.76ct | Marquise | E | VVS1 | Very Good
From $1,078
Compare at $1,552
IGISave 48.4%1.76ct | Marquise | F | VVS2 | Ideal
From $1,495
Compare at $2,900
IGISave 61.4%1.76ct | Marquise | D | VS1 | Ideal
From $877
Compare at $2,270
IGISave 39.5%1.76ct | Marquise | F | VS1 | Excellent
From $774
Compare at $1,280
IGISave 68.4%1.76ct | Marquise | E | VS2 | Very Good
From $636
Compare at $2,010
IGISave 65.4%1.76ct | Marquise | F | VVS2 | Very Good
From $729
Compare at $2,110
IGISave 84%1.76ct | Marquise | F | VVS2 | Excellent
From $672
Compare at $4,200
IGISave 48.4%1.76ct | Marquise | F | VVS2 | Very Good
From $1,089
Compare at $2,110
IGISave 60.6%1.76ct | Marquise | E | VS1 | Ideal
From $669
Compare at $1,697
IGISave 75.8%1.76ct | Marquise | E | VVS2 | Ideal
From $821
Compare at $3,390
IGISave 36.9%1.76ct | Marquise | F | VS1 | Ideal
From $1,280
Compare at $2,030
Entry pricing in this category starts around $479.
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 $4,445 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 $709 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 517 comparable stones in this segment. Prices start around $479 and go up to $4,924.
Based on the latest market data, the average asking price is about $860 with a median around $709.
The observed spread is roughly $4,445 across tracked listings, which is about 90.3% 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 $709, 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 7 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 $4,445 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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