6.6 Carat Round Lab Grown Diamond Prices Comparison
As of April 2026, 6.6 carat round lab grown diamonds usually range from $1,175 to $58,858, with an average price of $5,669.In the last month, prices for these diamonds are down 2.1%.Compare 73 verified listings across 7 retailers tracked by CaratRadar.
6.6 Carat Round Lab Grown Diamond Market Overview
CaratRadar currently tracks 73 verified 6.6-carat round lab grown diamonds listed across 7 online retailers. Prices in this segment range from $1,175 to $58,858, with an average asking price of $5,669 and a median of $3,934.
The price spread of $57,683 (98.0% 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.
73 diamonds tracked in this segment
Price range: $1,175 to $58,858
Average price: $5,669
Median price: $3,934
Available across 7 retailers
Savings potential: up to 98.0%
Price Range Overview
As of Apr 14, 2026Real market range for this carat, shape, and diamond type.
73
$1,175
$5,669
$3,934
$58,858
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 76.9%IGI | 6.6ct | Round | G | VS1 | Ideal
From $1,916
Compare at $8,310
Save 80.4%IGI | 6.6ct | Round | F | VVS2 | Ideal
From $3,435
Compare at $17,550
Save 75.3%IGI | 6.6ct | Round | G | VS1 | Ideal
From $2,810
Compare at $11,370
Save 75.2%IGI | 6.6ct | Round | G | VS1 | Ideal
From $1,916
Compare at $7,720
Save 86.2%IGI | 6.6ct | Round | E | VVS2 | Ideal
From $2,708
Compare at $19,670
Save 87.3%IGI | 6.6ct | Round | F | VS2 | Ideal
From $1,782
Compare at $14,030
Save 89.7%IGI | 6.6ct | Round | E | VVS2 | Ideal
From $2,017
Compare at $19,650
Save 88.7%IGI | 6.6ct | Round | E | VVS2 | Ideal
From $2,215
Compare at $19,680
Save 90.7%IGI | 6.6ct | Round | G | VS1 | Excellent
From $1,280
Compare at $13,770
Save 90.9%IGI | 6.6ct | Round | E | VVS2 | Excellent
From $1,780
Compare at $19,630
Save 77.8%IGI | 6.6ct | Round | F | VVS2 | Ideal
From $2,150
Compare at $9,680
Save 78.5%IGI | 6.6ct | Round | E | VS1 | Excellent
From $2,061
Compare at $9,590
Save 16.5%IGI | 6.6ct | Round | E | VS1 | Ideal
From $1,977
Compare at $2,369
Save 89.5%IGI | 6.6ct | Round | F | VVS2 | Ideal
From $1,858
Compare at $17,620
Save 67%IGI | 6.6ct | Round | D | VS1 | Ideal
From $3,514
Compare at $10,641
Save 78.5%IGI | 6.61ct | Round | G | VS1 | Ideal
From $1,919
Compare at $8,930
Save 79.8%IGI | 6.61ct | Round | G | VS1 | Ideal
From $1,919
Compare at $9,520
Save 76%IGI | 6.61ct | Round | G | VS2 | Ideal
From $1,821
Compare at $7,590
Save 47%IGI | 6.61ct | Round | E | VVS1 | Ideal
From $9,742
Compare at $18,375
Save 72.4%IGI | 6.61ct | Round | F | VVS2 | Excellent
From $1,785
Compare at $6,475
Save 73%IGI | 6.62ct | Round | G | IF | Ideal
From $13,823
Compare at $51,262
Save 84%IGI | 6.62ct | Round | E | VVS1 | Ideal
From $3,829
Compare at $23,910
Save 64.4%IGI | 6.62ct | Round | F | VS2 | Ideal
From $1,792
Compare at $5,030
Save 65.8%IGI | 6.62ct | Round | D | VS2 | Excellent
From $2,480
Compare at $7,256
Save 83.5%GIA | 6.63ct | Round | D | VVS2 | Excellent
From $8,820
Compare at $53,314
Save 81%IGI | 6.63ct | Round | G | VS1 | Ideal
From $1,925
Compare at $10,150
Save 72.6%IGI | 6.63ct | Round | G | VS2 | Ideal
From $1,805
Compare at $6,590
Save 66.6%IGI | 6.63ct | Round | E | VS1 | Excellent
From $3,450
Compare at $10,330
Save 83.7%IGI | 6.63ct | Round | F | VS2 | Ideal
From $2,312
Compare at $14,150
Save 86.2%IGI | 6.63ct | Round | E | VVS2 | Ideal
From $2,720
Compare at $19,760
Save 80.1%IGI | 6.63ct | Round | E | VS1 | Ideal
From $2,219
Compare at $11,160
Save 89.1%IGI | 6.63ct | Round | E | VVS2 | Excellent
From $2,154
Compare at $19,750
Save 87.3%IGI | 6.64ct | Round | F | VS2 | Excellent
From $1,787
Compare at $14,120
Save 77.5%IGI | 6.64ct | Round | G | VS2 | Ideal
From $1,830
Compare at $8,130
Save 53.5%IGI | 6.64ct | Round | G | VS1 | Ideal
From $1,740
Compare at $3,739
Save 86.2%IGI | 6.64ct | Round | E | VVS2 | Ideal
From $2,724
Compare at $19,790
Save 86.2%IGI | 6.64ct | Round | E | VVS2 | Ideal
From $2,724
Compare at $19,790
Save 87.3%IGI | 6.64ct | Round | E | VS1 | Excellent
From $2,182
Compare at $17,160
Save 62.7%IGI | 6.64ct | Round | G | VS1 | Excellent
From $1,690
Compare at $4,535
Save 65.1%IGI | 6.64ct | Round | E | VS2 | Excellent
From $1,808
Compare at $5,175
Save 74.5%IGI | 6.65ct | Round | G | VS2 | Ideal
From $1,810
Compare at $7,110
Save 87.3%IGI | 6.65ct | Round | F | VS2 | Ideal
From $1,796
Compare at $14,150
Save 82.4%IGI | 6.65ct | Round | F | SI1 | Ideal
From $1,762
Compare at $9,990
Save 72.4%IGI | 6.65ct | Round | F | VVS2 | Excellent
From $1,796
Compare at $6,515
Save 37.7%IGI | 6.65ct | Round | E | VVS2 | Ideal
From $2,530
Compare at $4,062
Save 47.5%GIA | 6.66ct | Round | E | VVS2 | Ideal
From $20,150
Compare at $38,370
Save 52.3%GIA | 6.66ct | Round | D | VVS1 | Excellent
From $16,497
Compare at $34,581
Save 76.3%IGI | 6.66ct | Round | G | VS2 | Ideal
From $1,812
Compare at $7,640
Save 86.3%IGI | 6.66ct | Round | D | VVS2 | Ideal
From $8,390
Compare at $61,290
Save 83.7%IGI | 6.66ct | Round | F | VS2 | Ideal
From $2,322
Compare at $14,210
Entry pricing in this category starts around $1,175.
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 $57,683 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 $3,934 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 73 comparable stones in this segment. Prices start around $1,175 and go up to $58,858.
Based on the latest market data, the average asking price is about $5,669 with a median around $3,934.
The observed spread is roughly $57,683 across tracked listings, which is about 98.0% 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 $3,934, 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 $57,683 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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