1.8 Carat Marquise Lab Grown Diamond Prices Comparison
As of May 2026, 1.8 carat marquise lab grown diamonds usually range from $281 to $6,050, with an average price of $1,317.In the last month, prices for these diamonds are up 1%.Compare 358 verified listings across 7 retailers tracked by CaratRadar.
1.8 Carat Marquise Lab Grown Diamond Market Overview
CaratRadar currently tracks 358 verified 1.8-carat marquise lab grown diamonds listed across 7 online retailers. Prices in this segment range from $281 to $6,050, with an average asking price of $1,317 and a median of $1,041.
The price spread of $5,769 (95.4% 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.
358 diamonds tracked in this segment
Price range: $281 to $6,050
Average price: $1,317
Median price: $1,041
Available across 7 retailers
Savings potential: up to 95.4%
Price Range Overview
As of May 29, 2026Real market range for this carat, shape, and diamond type.
358
$281
$1,317
$1,041
$6,050
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 64.3%IGI | 1.85ct | Marquise | G | VVS2 | Very Good
From $316
Compare at $884
Save 76.1%IGI | 1.83ct | Marquise | E | VS1 | Excellent
From $362
Compare at $1,515
Save 62.2%IGI | 1.87ct | Marquise | E | VS1 | Ideal
From $370
Compare at $980
Save 75.2%IGI | 1.88ct | Marquise | E | VS1 | Excellent
From $372
Compare at $1,500
Save 76.1%IGI | 1.89ct | Marquise | E | VS1 | Excellent
From $374
Compare at $1,565
Save 61.1%IGI | 1.85ct | Marquise | F | VS1 | Very Good
From $378
Compare at $972
IGI | 1.85ct | Marquise | F | VS1 | Excellent
From $393
Compare at $763
Save 77%IGI | 1.84ct | Marquise | E | VVS2 | Very Good
From $393
Compare at $1,710
Save 53.9%IGI | 1.87ct | Marquise | G | VS2 | Very Good
From $412
Compare at $893
Save 71.9%IGI | 1.86ct | Marquise | FANCY | VS2 | Very Good
From $423
Compare at $1,504
Save 54.1%IGI | 1.81ct | Marquise | E | VS2 | Very Good
From $424
Compare at $924
Save 78.8%IGI | 1.88ct | Marquise | D | VS1 | Ideal
From $435
Compare at $2,050
Save 70%IGI | 1.82ct | Marquise | E | VS2 | Excellent
From $438
Compare at $1,459
Save 79.7%IGI | 1.89ct | Marquise | D | VS1 | Excellent
From $438
Compare at $2,160
Save 75.9%IGI | 1.81ct | Marquise | F | VVS2 | Very Good
From $439
Compare at $1,820
Save 78.9%IGI | 1.87ct | Marquise | F | VS2 | Ideal
From $441
Compare at $2,090
Save 65.6%IGI | 1.82ct | Marquise | F | VVS2 | Very Good
From $442
Compare at $1,286
Save 72.7%IGI | 1.84ct | Marquise | F | VS2 | Excellent
From $445
Compare at $1,630
Save 79.2%IGI | 1.85ct | Marquise | F | VS2 | Excellent
From $447
Compare at $2,150
Save 52.5%IGI | 1.82ct | Marquise | E | VS1 | Very Good
From $451
Compare at $950
Save 61.7%IGI | 1.88ct | Marquise | F | VVS2 | Very Good
From $453
Compare at $1,182
Save 52.8%IGI | 1.83ct | Marquise | E | VS1 | Very Good
From $453
Compare at $960
Save 51.3%IGI | 1.81ct | Marquise | E | VS1 | Very Good
From $454
Compare at $933
Save 61.7%IGI | 1.87ct | Marquise | F | VVS2 | Very Good
From $459
Compare at $1,199
Save 52.4%IGI | 1.82ct | Marquise | E | VS2 | Very Good
From $459
Compare at $964
Save 53.5%IGI | 1.83ct | Marquise | E | VS1 | Very Good
From $461
Compare at $991
Save 71.9%IGI | 1.85ct | Marquise | FANCY | VS2 | Very Good
From $462
Compare at $1,646
Save 78.3%IGI | 1.84ct | Marquise | E | VVS2 | Very Good
From $468
Compare at $2,160
Save 54%IGI | 1.89ct | Marquise | E | VS1 | Very Good
From $468
Compare at $1,018
Save 76%IGI | 1.87ct | Marquise | E | VS2 | Excellent
From $470
Compare at $1,960
Save 74.7%IGI | 1.86ct | Marquise | F | VVS2 | Ideal
From $473
Compare at $1,870
Save 61.7%IGI | 1.84ct | Marquise | E | VS1 | Very Good
From $474
Compare at $1,237
Save 79.1%IGI | 1.83ct | Marquise | F | VS1 | Ideal
From $475
Compare at $2,270
Save 79.1%IGI | 1.83ct | Marquise | E | VS2 | Excellent
From $475
Compare at $2,270
Save 79%IGI | 1.82ct | Marquise | F | VS1 | Excellent
From $475
Compare at $2,260
Save 79.1%IGI | 1.83ct | Marquise | E | VS2 | Excellent
From $475
Compare at $2,270
Save 79%IGI | 1.82ct | Marquise | F | VS1 | Excellent
From $475
Compare at $2,260
Save 79.1%IGI | 1.83ct | Marquise | F | VS1 | Excellent
From $475
Compare at $2,270
Save 78%IGI | 1.84ct | Marquise | E | VS2 | Excellent
From $475
Compare at $2,160
Save 79.1%IGI | 1.83ct | Marquise | E | VS2 | Very Good
From $475
Compare at $2,270
Save 80%IGI | 1.86ct | Marquise | F | VVS2 | Excellent
From $475
Compare at $2,370
Save 77.6%IGI | 1.88ct | Marquise | F | VVS2 | Excellent
From $479
Compare at $2,140
Save 78.8%IGI | 1.82ct | Marquise | F | VS1 | Excellent
From $480
Compare at $2,260
Save 79%IGI | 1.83ct | Marquise | F | VS1 | Excellent
From $480
Compare at $2,290
Save 76.7%IGI | 1.88ct | Marquise | F | VVS2 | Excellent
From $480
Compare at $2,060
Save 66.4%IGI | 1.88ct | Marquise | E | VVS2 | Very Good
From $481
Compare at $1,433
Save 79.4%IGI | 1.82ct | Marquise | F | VVS2 | Excellent
From $485
Compare at $2,350
Save 70.2%IGI | 1.84ct | Marquise | F | VS2 | Ideal
From $485
Compare at $1,630
Save 54.7%IGI | 1.86ct | Marquise | E | VVS2 | Very Good
From $486
Compare at $1,072
Save 79.1%IGI | 1.82ct | Marquise | F | VVS2 | Ideal
From $490
Compare at $2,350
Entry pricing in this category starts around $281.
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 $5,769 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 $1,041 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 358 comparable stones in this segment. Prices start around $281 and go up to $6,050.
Based on the latest market data, the average asking price is about $1,317 with a median around $1,041.
The observed spread is roughly $5,769 across tracked listings, which is about 95.4% from highest to lowest offer in this bucket.
We refresh pricing data daily so these pages stay current with market changes.
Based on completed market data, the fair market benchmark is $1,317. The median price is $1,041, 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 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 $5,769 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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