6.6 Carat Round Lab Grown Diamond Prices Comparison
As of February 2026, 6.6 carat round lab grown diamonds usually range from $1,440 to $48,939, with an average price of $3,166.In the last month, prices for these diamonds are down 4.2%.Compare 134 verified listings across 6 retailers tracked by CaratRadar.
6.6 Carat Round Lab Grown Diamond Market Overview
CaratRadar currently tracks 134 verified 6.6-carat round lab grown diamonds listed across 6 online retailers. Prices in this segment range from $1,440 to $48,939, with an average asking price of $3,166 and a median of $1,942.
The price spread of $47,499 (97.1% 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.
134 diamonds tracked in this segment
Price range: $1,440 to $48,939
Average price: $3,166
Median price: $1,942
Available across 6 retailers
Savings potential: up to 97.1%
Price Range Overview
As of Feb 28, 2026Real market range for this carat, shape, and diamond type.
134
$1,440
$3,166
$1,942
$48,939
Price History
Price Comparison Matrix
Live Listings
See all listingsCompare current retailer offers for this exact segment and open any listing for full details.
HRDSave 56%6.55ct | Round | D | VVS2 | Excellent
From $3,898
Compare at $8,858
IGISave 85%6.55ct | Round | F | VS1 | Excellent
From $1,558
Compare at $10,410
IGISave 82.7%6.55ct | Round | E | VVS1 | Ideal
From $4,103
Compare at $23,660
IGISave 78.4%6.55ct | Round | E | VVS2 | Excellent
From $2,234
Compare at $10,360
IGISave 88.1%6.55ct | Round | F | VS2 | Ideal
From $1,968
Compare at $16,540
IGISave 88.6%6.55ct | Round | G | VS2 | Ideal
From $1,569
Compare at $13,740
IGISave 56.1%6.55ct | Round | G | VVS2 | Ideal
From $1,973
Compare at $4,499
IGISave 84.5%6.55ct | Round | E | VVS2 | Excellent
From $1,513
Compare at $9,730
IGI6.55ct | Round | E | VVS2 | Excellent
From $2,134
Compare at $2,256
IGISave 87.8%6.55ct | Round | E | VS1 | Ideal
From $2,081
Compare at $17,010
IGISave 90%6.55ct | Round | E | VVS2 | Excellent
From $1,938
Compare at $19,410
IGISave 85.1%6.55ct | Round | F | VVS2 | Excellent
From $1,605
Compare at $10,760
IGISave 83.5%6.55ct | Round | E | VVS1 | Ideal
From $3,912
Compare at $23,660
IGISave 85.1%6.55ct | Round | E | VS1 | Excellent
From $1,629
Compare at $10,940
IGISave 84.9%6.55ct | Round | E | VVS2 | Excellent
From $1,483
Compare at $9,840
IGI6.55ct | Round | E | VVS2 | Excellent
From $2,134
Compare at $2,256
IGISave 62.1%6.55ct | Round | E | VVS2 | Ideal
From $1,657
Compare at $4,368
IGISave 84.1%6.55ct | Round | E | VVS2 | Ideal
From $1,973
Compare at $12,400
IGISave 20%6.55ct | Round | E | VVS2 | Excellent
From $1,806
Compare at $2,256
IGISave 67.8%6.55ct | Round | F | VS2 | Excellent
From $1,538
Compare at $4,780
IGISave 77.8%6.55ct | Round | F | VS1 | Ideal
From $2,135
Compare at $9,610
IGISave 83%6.55ct | Round | E | VVS1 | Ideal
From $4,027
Compare at $23,660
IGISave 90%6.55ct | Round | E | VVS2 | Excellent
From $1,938
Compare at $19,410
IGISave 50.8%6.55ct | Round | E | VVS2 | Excellent
From $9,545
Compare at $19,410
IGISave 84.8%6.55ct | Round | E | VS1 | Excellent
From $1,659
Compare at $10,940
IGISave 70.1%6.55ct | Round | F | VS2 | Ideal
From $1,489
Compare at $4,975
IGISave 85.1%6.56ct | Round | F | SI1 | Ideal
From $1,779
Compare at $11,930
IGISave 79.4%6.56ct | Round | G | VS2 | Ideal
From $1,524
Compare at $7,390
IGISave 85.5%6.56ct | Round | G | VS2 | Ideal
From $1,673
Compare at $11,560
IGI6.56ct | Round | E | VVS2 | Ideal
From $2,122
Compare at $2,289
IGISave 52.8%6.56ct | Round | D | VS1 | Excellent
From $3,031
Compare at $6,425
IGISave 80.5%6.56ct | Round | F | VS2 | Ideal
From $1,833
Compare at $9,410
IGISave 87.2%6.56ct | Round | F | VVS2 | Ideal
From $2,226
Compare at $17,450
IGISave 80.5%6.56ct | Round | F | VVS2 | Excellent
From $1,729
Compare at $8,890
IGISave 89%6.56ct | Round | E | VVS2 | Ideal
From $2,144
Compare at $19,440
IGISave 52.6%6.56ct | Round | G | VS2 | Ideal
From $1,660
Compare at $3,501
IGISave 82.7%6.56ct | Round | F | VS1 | Ideal
From $1,601
Compare at $9,270
IGISave 67.8%6.56ct | Round | F | VS2 | Excellent
From $1,540
Compare at $4,785
IGISave 92.1%6.56ct | Round | F | VVS2 | Ideal
From $1,607
Compare at $20,350
IGISave 86.9%6.56ct | Round | G | VS2 | Ideal
From $1,808
Compare at $13,770
IGISave 81.1%6.56ct | Round | F | VS2 | Ideal
From $1,571
Compare at $8,330
IGISave 80.5%6.56ct | Round | E | VS1 | Excellent
From $1,729
Compare at $8,890
IGISave 89.9%6.56ct | Round | G | VS1 | Ideal
From $1,637
Compare at $16,150
IGISave 87.7%6.57ct | Round | F | VS1 | Ideal
From $1,579
Compare at $12,890
IGISave 86.9%6.57ct | Round | G | VS2 | Ideal
From $1,810
Compare at $13,780
IGISave 81%6.57ct | Round | F | VS2 | Ideal
From $1,586
Compare at $8,340
IGISave 90.9%6.57ct | Round | E | VS1 | Ideal
From $1,816
Compare at $19,940
IGISave 56.4%6.57ct | Round | G | VS2 | Ideal
From $1,810
Compare at $4,150
IGISave 85%6.57ct | Round | E | VVS2 | Ideal
From $1,757
Compare at $11,680
GIASave 86.5%6.57ct | Round | D | VS1 | Excellent
From $7,080
Compare at $52,430
Entry pricing in this category starts around $1,440.
What to Know When Shopping for 6.6 Carat Round Lab Grown Diamonds
- Always compare identical certified diamonds across retailers. Identical certificate numbers can have price differences of $47,499 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 $1,942 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.
- Round brilliants command a premium due to higher rough waste during cutting. If budget matters, consider oval or cushion shapes for similar visual size.
Frequently Asked Questions
We currently track 134 comparable stones in this segment. Prices start around $1,440 and go up to $48,939.
Based on the latest market data, the average asking price is about $3,166 with a median around $1,942.
The observed spread is roughly $47,499 across tracked listings, which is about 97.1% 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 $1,942, 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 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. The exact certified diamond can differ by $47,499 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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