6.6 Carat Marquise Lab Grown Diamond Prices Comparison
As of February 2026, 6.6 carat marquise lab grown diamonds usually range from $921 to $14,180, with an average price of $2,119.In the last month, prices for these diamonds are down 3.1%.Compare 52 verified listings across 4 retailers tracked by CaratRadar.
6.6 Carat Marquise Lab Grown Diamond Market Overview
CaratRadar currently tracks 52 verified 6.6-carat marquise lab grown diamonds listed across 4 online retailers. Prices in this segment range from $921 to $14,180, with an average asking price of $2,119 and a median of $1,593.
The price spread of $13,259 (93.5% 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.
52 diamonds tracked in this segment
Price range: $921 to $14,180
Average price: $2,119
Median price: $1,593
Available across 4 retailers
Savings potential: up to 93.5%
Price Range Overview
As of Feb 28, 2026Real market range for this carat, shape, and diamond type.
52
$921
$2,119
$1,593
$14,180
Price History
Price Comparison Matrix
Live Listings
See all listingsCompare current retailer offers for this exact segment and open any listing for full details.
IGI6.55ct | Marquise | F | VS2 | Ideal
From $1,172
Compare at $1,297
IGISave 63.4%6.55ct | Marquise | G | VS1 | Ideal
From $1,122
Compare at $3,064
IGISave 91.2%6.55ct | Marquise | E | VVS2 | Excellent
From $1,589
Compare at $18,060
IGISave 81%6.55ct | Marquise | F | VS1 | Very Good
From $1,747
Compare at $9,200
IGISave 77.3%6.55ct | Marquise | F | VVS2 | Ideal
From $1,458
Compare at $6,415
IGISave 72.4%6.55ct | Marquise | F | VS2 | Ideal
From $1,317
Compare at $4,780
IGISave 85.9%6.55ct | Marquise | F | VS1 | Ideal
From $1,914
Compare at $13,570
IGISave 43.5%6.56ct | Marquise | F | VS1 | Ideal
From $1,274
Compare at $2,256
IGISave 71.9%6.56ct | Marquise | E | VS1 | Ideal
From $1,526
Compare at $5,440
IGISave 91%6.56ct | Marquise | F | VVS2 | Good
From $1,488
Compare at $16,470
IGISave 61.3%6.56ct | Marquise | E | VS1 | Very Good
From $2,100
Compare at $5,430
IGISave 77.3%6.56ct | Marquise | F | VVS2 | Ideal
From $1,460
Compare at $6,425
IGISave 91.2%6.56ct | Marquise | E | VS1 | Excellent
From $1,565
Compare at $17,740
IGISave 77.1%6.57ct | Marquise | E | VS1 | Excellent
From $1,795
Compare at $7,827
IGISave 84.3%6.57ct | Marquise | F | VVS2 | Excellent
From $2,346
Compare at $14,930
IGISave 91.3%6.57ct | Marquise | F | VS2 | Ideal
From $1,013
Compare at $11,590
IGISave 72.7%6.57ct | Marquise | F | VS1 | Ideal
From $1,362
Compare at $4,990
IGISave 91%6.57ct | Marquise | E | VS1 | Excellent
From $1,597
Compare at $17,770
IGISave 73.4%6.57ct | Marquise | E | VS2 | Ideal
From $1,362
Compare at $5,120
IGI6.57ct | Marquise | F | VS2 | Ideal
From $1,188
Compare at $1,301
IGISave 76.1%6.57ct | Marquise | F | VS1 | Very Good
From $1,790
Compare at $7,480
IGISave 40.8%6.57ct | Marquise | H | VS1 | Ideal
From $1,003
Compare at $1,694
IGISave 72.2%6.58ct | Marquise | E | VS1 | Very Good
From $3,708
Compare at $13,350
IGISave 73.8%6.58ct | Marquise | E | VS2 | Ideal
From $1,343
Compare at $5,130
GIASave 73.7%6.58ct | Marquise | E | VVS2 | Excellent
From $8,606
Compare at $32,680
IGISave 86.4%6.58ct | Marquise | E | VVS2 | Ideal
From $2,236
Compare at $16,480
IGISave 91.2%6.58ct | Marquise | E | VS1 | Excellent
From $1,569
Compare at $17,800
IGISave 62.2%6.58ct | Marquise | I | VS1 | Ideal
From $921
Compare at $2,435
IGISave 77.1%6.59ct | Marquise | F | VVS2 | Ideal
From $2,268
Compare at $9,910
IGISave 76.2%6.59ct | Marquise | G | VS1 | Very Good
From $1,619
Compare at $6,790
IGISave 85.9%6.59ct | Marquise | F | VS2 | Excellent
From $1,646
Compare at $11,700
IGISave 90.1%6.6ct | Marquise | F | VVS2 | Ideal
From $1,476
Compare at $14,870
IGISave 54.3%6.6ct | Marquise | F | VS1 | Ideal
From $3,447
Compare at $7,540
IGISave 86.3%6.6ct | Marquise | G | VS1 | Ideal
From $1,602
Compare at $11,710
IGISave 87.9%6.6ct | Marquise | G | VVS2 | Excellent
From $1,602
Compare at $13,250
IGISave 84.6%6.61ct | Marquise | H | VVS2 | Excellent
From $1,697
Compare at $11,040
IGISave 90.4%6.61ct | Marquise | G | VS1 | Ideal
From $1,124
Compare at $11,650
IGISave 54.3%6.61ct | Marquise | F | VS1 | Ideal
From $3,451
Compare at $7,550
IGISave 78.2%6.61ct | Marquise | F | VVS2 | Ideal
From $1,471
Compare at $6,740
GIASave 14.3%6.62ct | Marquise | F | VS1 | Ideal
From $14,180
Compare at $16,550
IGISave 90.8%6.62ct | Marquise | E | VS2 | Ideal
From $1,200
Compare at $13,090
IGISave 91.4%6.62ct | Marquise | F | VS2 | Ideal
From $1,008
Compare at $11,670
IGISave 83.5%6.63ct | Marquise | G | VVS2 | Ideal
From $2,198
Compare at $13,320
IGISave 86.9%6.63ct | Marquise | E | VVS2 | Ideal
From $2,188
Compare at $16,720
IGISave 60.2%6.63ct | Marquise | H | VS1 | Ideal
From $1,197
Compare at $3,008
IGISave 91.4%6.64ct | Marquise | F | VS2 | Ideal
From $1,011
Compare at $11,710
IGISave 54.3%6.64ct | Marquise | F | VS1 | Ideal
From $3,467
Compare at $7,590
IGISave 54.3%6.64ct | Marquise | F | VVS2 | Ideal
From $3,640
Compare at $7,970
IGISave 79.8%6.65ct | Marquise | E | VS2 | Ideal
From $2,650
Compare at $13,150
IGISave 90.3%6.65ct | Marquise | G | VS1 | Ideal
From $1,149
Compare at $11,800
Entry pricing in this category starts around $921.
What to Know When Shopping for 6.6 Carat Marquise Lab Grown Diamonds
- Always compare identical certified diamonds across retailers. Identical certificate numbers can have price differences of $13,259 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 $1,593 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 52 comparable stones in this segment. Prices start around $921 and go up to $14,180.
Based on the latest market data, the average asking price is about $2,119 with a median around $1,593.
The observed spread is roughly $13,259 across tracked listings, which is about 93.5% 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 $1,593, 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 4 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 $13,259 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
Explore adjacent carat ranges and shapes to compare market shifts.
6.5 Carat Marquise Lab Grown Diamond Prices
6.7 Carat Marquise Lab Grown Diamond Prices
6.4 Carat Marquise Lab Grown Diamond Prices
6.8 Carat Marquise Lab Grown Diamond Prices
6.3 Carat Marquise Lab Grown Diamond Prices
6.9 Carat Marquise Lab Grown Diamond Prices
6.2 Carat Marquise Lab Grown Diamond Prices
6.6 Carat Oval Lab Grown Diamond Prices
6.6 Carat Emerald Lab Grown Diamond Prices
6.6 Carat Round Lab Grown Diamond Prices
6.6 Carat Radiant Lab Grown Diamond Prices
6.6 Carat Cushion Lab Grown Diamond Prices
Tracking Lab Grown inventory for 6.6 carat Marquise diamonds.