12 Carat Marquise Lab Grown Diamond Prices Comparison
A 12 carat marquise lab grown diamond typically costs $7,358 (median of 109 listings at 6 online stores), with most between $2,874 and $25,032. Average prices fell 6.5% over the last month. Updated .
Average $9,228. Listings run from $1,821 to $146,152 in the 12.00–12.99 carat range.
See the live listings12 Carat Marquise Lab Grown Diamond Market Overview
CaratRadar currently tracks 109 verified 12-carat marquise lab grown diamonds in the 12.00–12.99 carat benchmark range, listed across 6 online retailers. Prices in this segment range from $1,821 to $146,152, with an average asking price of $9,228 and a median of $7,358.
Across this category, asking prices span $144,331 (98.8% from the most expensive to the cheapest listing). The same certified diamond can also be listed at different prices by different retailers, which is why CaratRadar compares stones by certificate number.
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.
109 diamonds tracked in the 12.00–12.99 carat benchmark
Price range: $1,821 to $146,152
Average price: $9,228
Median price: $7,358
Available across 6 retailers
Category price spread: 98.8%
Price Range Overview
As of Oct 23, 2026Real market range for this carat, shape, and diamond type.
109
$1,821
$9,228
$7,358
$146,152
Price History
Price Comparison Matrix
Compare nearby
Prices for the next carat weights, other shapes and the natural twin.
Nearby carat weights
Other shapes at 12 carat
- 12 carat round lab grown diamond pricesAverage $12,998
- 12 carat cushion lab grown diamond pricesAverage $12,202
- 12 carat oval lab grown diamond pricesAverage $9,424
- 12 carat emerald lab grown diamond pricesAverage $6,859
- 12 carat pear lab grown diamond pricesAverage $9,330
- 12 carat radiant lab grown diamond pricesAverage $9,189
Live Listings
See all listingsCompare current retailer offers in the same benchmark range and open any listing for full details.
Save 78.9%IGI | 12.44ct | Marquise | F | VS1 | Ideal
From $2,059
Compare at $9,769
Save 78.8%IGI | 12.01ct | Marquise | F | VVS2 | Very Good
From $2,073
Compare at $9,767
Save 78.1%IGI | 12.1ct | Marquise | F | VVS2 | Excellent
From $2,173
Compare at $9,931
Save 76.6%IGI | 12.19ct | Marquise | F | VVS2 | Excellent
From $2,355
Compare at $10,075
Save 31.7%IGI | 12.05ct | Marquise | F | VVS2 | Ideal
From $2,443
Compare at $3,576
Save 31.7%IGI | 12.44ct | Marquise | F | VS1 | Ideal
From $2,451
Compare at $3,588
Save 31.7%IGI | 12.27ct | Marquise | E | VS1 | Ideal
From $2,464
Compare at $3,607
Save 78.9%IGI | 12ct | Marquise | F | VVS2 | Ideal
From $2,479
Compare at $11,760
Save 79.7%IGI | 12.02ct | Marquise | F | VVS2 | Ideal
From $2,483
Compare at $12,260
Save 78.9%IGI | 12.03ct | Marquise | F | VVS2 | Excellent
From $2,485
Compare at $11,785
Save 73.2%IGI | 12.03ct | Marquise | F | VS1 | Ideal
From $2,493
Compare at $9,298
Save 78.9%IGI | 12.08ct | Marquise | F | VVS2 | Ideal
From $2,495
Compare at $11,835
Save 79.7%IGI | 12.1ct | Marquise | F | VVS2 | Ideal
From $2,499
Compare at $12,340
Save 78.9%IGI | 12.11ct | Marquise | F | VVS2 | Ideal
From $2,501
Compare at $11,865
Save 78.9%IGI | 12.13ct | Marquise | F | VVS2 | Excellent
From $2,505
Compare at $11,885
Save 79.7%IGI | 12.14ct | Marquise | F | VVS2 | Excellent
From $2,508
Compare at $12,380
Save 79.6%IGI | 12.03ct | Marquise | F | VVS2 | Excellent
From $2,508
Compare at $12,270
Save 78.9%IGI | 12.18ct | Marquise | F | VVS2 | Excellent
From $2,516
Compare at $11,935
Save 78.9%IGI | 12.19ct | Marquise | F | VVS2 | Excellent
From $2,518
Compare at $11,945
Save 78.9%IGI | 12.19ct | Marquise | F | VVS2 | Excellent
From $2,518
Compare at $11,945
Save 79.7%IGI | 12.19ct | Marquise | F | VVS2 | Excellent
From $2,518
Compare at $12,430
Save 79.7%IGI | 12.2ct | Marquise | F | VVS2 | Excellent
From $2,520
Compare at $12,440
Save 78.9%IGI | 12.21ct | Marquise | F | VVS2 | Ideal
From $2,522
Compare at $11,965
Save 79.7%IGI | 12.24ct | Marquise | F | VVS2 | Ideal
From $2,528
Compare at $12,480
Save 78.9%IGI | 12.33ct | Marquise | F | VVS2 | Ideal
From $2,547
Compare at $12,080
Save 78.9%IGI | 12.35ct | Marquise | F | VVS2 | Excellent
From $2,551
Compare at $12,100
Save 78.7%IGI | 12.26ct | Marquise | F | VVS2 | Excellent
From $2,556
Compare at $12,010
Save 78.9%IGI | 12.38ct | Marquise | F | VVS2 | Excellent
From $2,557
Compare at $12,130
Save 79.7%IGI | 12.39ct | Marquise | F | VVS2 | Excellent
From $2,559
Compare at $12,635
Save 79.7%IGI | 12.4ct | Marquise | F | VVS2 | Ideal
From $2,561
Compare at $12,645
Save 79.6%IGI | 12.34ct | Marquise | F | VVS2 | Ideal
From $2,572
Compare at $12,585
Save 53.2%IGI | 12.34ct | Marquise | F | VVS2 | Excellent
From $2,572
Compare at $5,501
Save 78.9%IGI | 12.49ct | Marquise | F | VVS2 | Excellent
From $2,580
Compare at $12,240
Save 78.9%IGI | 12.5ct | Marquise | F | VVS2 | Ideal
From $2,582
Compare at $12,250
Save 79.7%IGI | 12.5ct | Marquise | F | VVS2 | Ideal
From $2,582
Compare at $12,750
Save 79.7%IGI | 12.52ct | Marquise | F | VVS2 | Ideal
From $2,586
Compare at $12,770
Save 31.7%IGI | 12.01ct | Marquise | E | VS2 | Ideal
From $2,618
Compare at $3,834
Save 78.9%IGI | 12.76ct | Marquise | F | VVS2 | Ideal
From $2,636
Compare at $12,500
Save 79.7%IGI | 12.87ct | Marquise | F | VVS2 | Ideal
From $2,658
Compare at $13,125
Save 73.6%IGI | 12.02ct | Marquise | F | VVS2 | Ideal
From $2,726
Compare at $10,322
Save 73.6%IGI | 12.02ct | Marquise | F | VVS2 | Ideal
From $2,726
Compare at $10,322
Save 72.2%IGI | 12.03ct | Marquise | F | VVS2 | Ideal
From $2,728
Compare at $9,799
Save 72.2%IGI | 12.05ct | Marquise | F | VVS2 | Ideal
From $2,733
Compare at $9,831
Save 72.2%IGI | 12.05ct | Marquise | F | VVS2 | Very Good
From $2,733
Compare at $9,831
Save 72.2%IGI | 12.05ct | Marquise | F | VVS2 | Very Good
From $2,733
Compare at $9,831
Save 72.3%IGI | 12.09ct | Marquise | F | VVS2 | Ideal
From $2,742
Compare at $9,894
Save 31.7%IGI | 12.2ct | Marquise | E | VVS2 | Ideal
From $2,753
Compare at $4,031
Save 71.6%IGI | 12.01ct | Marquise | F | VVS2 | Very Good
From $2,773
Compare at $9,779
Save 73.6%IGI | 12.08ct | Marquise | F | VVS2 | Very Good
From $2,789
Compare at $10,583
Save 73.6%IGI | 12.52ct | Marquise | F | VVS2 | Ideal
From $2,840
Compare at $10,752
Entry pricing in this benchmark range starts around $1,821.
What to Know When Shopping for 12 Carat Marquise Lab Grown Diamonds
- Always compare identical certified diamonds across retailers, because the same certificate can be listed at different prices by different stores. Across this whole category, asking prices span $144,331 from the cheapest to the most expensive listing.
- 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 $7,358 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 109 comparable stones in the 12.00–12.99 carat benchmark range. Prices start around $1,821 and go up to $146,152.
Based on the latest market data, the average asking price is about $9,228 with a median around $7,358.
The observed spread is roughly $144,331 across tracked listings, which is about 98.8% from highest to lowest offer in the 12.00–12.99 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 $9,228. The median price is $7,358, 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 6 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. Across this category, asking prices span $144,331 from the cheapest to the most expensive listing, and the same certified diamond can also carry different prices at different 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.
Tools and Guides
Tracking Lab Grown inventory for the 12.00–12.99 carat Marquise diamond benchmark.