6.6 Carat Radiant Lab Grown Diamond Prices Comparison
As of February 2026, 6.6 carat radiant lab grown diamonds usually range from $1,282 to $18,530, with an average price of $2,663.In the last month, prices for these diamonds are down 2.2%.Compare 83 verified listings across 6 retailers tracked by CaratRadar.
6.6 Carat Radiant Lab Grown Diamond Market Overview
CaratRadar currently tracks 83 verified 6.6-carat radiant lab grown diamonds listed across 6 online retailers. Prices in this segment range from $1,282 to $18,530, with an average asking price of $2,663 and a median of $1,829.
The price spread of $17,248 (93.1% 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.
83 diamonds tracked in this segment
Price range: $1,282 to $18,530
Average price: $2,663
Median price: $1,829
Available across 6 retailers
Savings potential: up to 93.1%
Price Range Overview
As of Feb 28, 2026Real market range for this carat, shape, and diamond type.
83
$1,282
$2,663
$1,829
$18,530
Price History
Price Comparison Matrix
Live Listings
See all listingsCompare current retailer offers for this exact segment and open any listing for full details.
IGISave 88.7%6.55ct | Radiant | F | VVS2 | Excellent
From $1,849
Compare at $16,400
IGISave 87.3%6.55ct | Radiant | F | VS1 | Excellent
From $1,723
Compare at $13,560
IGISave 88.9%6.55ct | Radiant | F | VVS2 | Very Good
From $1,819
Compare at $16,400
IGISave 89%6.56ct | Radiant | G | VS1 | Ideal
From $1,541
Compare at $13,950
IGISave 90.3%6.56ct | Radiant | E | VS1 | Excellent
From $1,822
Compare at $18,790
IGISave 71.3%6.56ct | Radiant | E | VS2 | Ideal
From $1,469
Compare at $5,115
IGISave 88.9%6.56ct | Radiant | F | VVS2 | Excellent
From $1,822
Compare at $16,420
IGISave 77.2%6.56ct | Radiant | G | VVS2 | Very Good
From $2,017
Compare at $8,830
IGISave 89.5%6.56ct | Radiant | F | VS1 | Very Good
From $1,694
Compare at $16,150
IGISave 76.7%6.56ct | Radiant | D | VVS2 | Ideal
From $4,515
Compare at $19,340
IGISave 90.3%6.56ct | Radiant | E | VS1 | Excellent
From $1,822
Compare at $18,790
IGISave 89.5%6.56ct | Radiant | F | VS1 | Excellent
From $1,694
Compare at $16,150
IGISave 89.1%6.56ct | Radiant | E | VS1 | Ideal
From $1,781
Compare at $16,400
IGISave 86.6%6.57ct | Radiant | G | VS1 | Ideal
From $1,557
Compare at $11,580
IGISave 55.7%6.57ct | Radiant | G | VS2 | Excellent
From $2,928
Compare at $6,610
IGISave 53.9%6.57ct | Radiant | FANCY | VS1 | Very Good
From $4,327
Compare at $9,392
IGISave 89.3%6.57ct | Radiant | F | VVS2 | Ideal
From $1,561
Compare at $14,640
IGISave 90.9%6.57ct | Radiant | E | VS1 | Ideal
From $1,917
Compare at $21,100
GIASave 74.4%6.57ct | Radiant | E | VVS1 | Excellent
From $12,636
Compare at $49,350
GIASave 66.1%6.57ct | Radiant | E | VS1 | Excellent
From $5,555
Compare at $16,380
IGISave 89.1%6.57ct | Radiant | G | VS2 | Ideal
From $1,387
Compare at $12,730
IGISave 42%6.57ct | Radiant | D | VVS2 | Excellent
From $6,857
Compare at $11,821
IGISave 50.9%6.57ct | Radiant | G | VS1 | Excellent
From $2,915
Compare at $5,932
IGISave 86.7%6.57ct | Radiant | G | VS2 | Ideal
From $1,692
Compare at $12,730
IGISave 71.3%6.58ct | Radiant | F | VS2 | Ideal
From $2,871
Compare at $10,020
GIASave 75.5%6.58ct | Radiant | E | VS1 | Excellent
From $5,102
Compare at $20,800
IGISave 88.9%6.58ct | Radiant | F | VVS2 | Excellent
From $1,827
Compare at $16,470
IGISave 85.4%6.58ct | Radiant | E | VVS2 | Good
From $2,423
Compare at $16,640
GIASave 76.7%6.58ct | Radiant | E | VVS2 | Excellent
From $7,364
Compare at $31,670
IGISave 88.9%6.58ct | Radiant | F | VVS2 | Excellent
From $1,827
Compare at $16,470
IGISave 83.4%6.58ct | Radiant | E | VVS2 | Excellent
From $2,713
Compare at $16,310
IGISave 89.5%6.58ct | Radiant | F | VS1 | Excellent
From $1,698
Compare at $16,200
IGISave 84.6%6.58ct | Radiant | E | VVS2 | Excellent
From $2,534
Compare at $16,410
IGISave 90%6.59ct | Radiant | E | VS2 | Excellent
From $1,636
Compare at $16,280
IGISave 72.8%6.59ct | Radiant | F | VS1 | Ideal
From $1,417
Compare at $5,205
IGISave 72.8%6.59ct | Radiant | F | VS1 | Ideal
From $1,417
Compare at $5,205
IGISave 82.2%6.59ct | Radiant | F | VS1 | Excellent
From $2,014
Compare at $11,330
GIASave 75.6%6.59ct | Radiant | E | VVS2 | Excellent
From $5,333
Compare at $21,820
IGISave 34.5%6.59ct | Radiant | E | VVS1 | Ideal
From $18,530
Compare at $28,270
IGISave 88.4%6.59ct | Radiant | F | VVS2 | Excellent
From $1,709
Compare at $14,770
IGISave 87.9%6.59ct | Radiant | E | VVS2 | Excellent
From $1,987
Compare at $16,380
IGISave 20.4%6.59ct | Radiant | G | VS2 | Very Good
From $1,414
Compare at $1,776
IGISave 29%6.59ct | Radiant | H | VS1 | Ideal
From $1,426
Compare at $2,009
IGISave 76%6.59ct | Radiant | E | VS2 | Ideal
From $3,123
Compare at $13,030
IGISave 88.9%6.59ct | Radiant | F | VVS2 | Very Good
From $1,829
Compare at $16,500
IGISave 89.5%6.59ct | Radiant | F | VS1 | Excellent
From $1,700
Compare at $16,220
IGISave 86.2%6.59ct | Radiant | E | VS1 | Excellent
From $2,268
Compare at $16,380
IGISave 90.3%6.59ct | Radiant | E | VS1 | Excellent
From $1,829
Compare at $18,870
IGISave 89.4%6.59ct | Radiant | E | VVS2 | Very Good
From $2,023
Compare at $19,100
IGISave 81.9%6.59ct | Radiant | F | VVS1 | Ideal
From $3,389
Compare at $18,770
Entry pricing in this category starts around $1,282.
What to Know When Shopping for 6.6 Carat Radiant Lab Grown Diamonds
- Always compare identical certified diamonds across retailers. Identical certificate numbers can have price differences of $17,248 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 $1,829 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.
- Radiant cuts combine the elegance of emerald shapes with the brilliance of round cuts, offering good value per carat.
Frequently Asked Questions
We currently track 83 comparable stones in this segment. Prices start around $1,282 and go up to $18,530.
Based on the latest market data, the average asking price is about $2,663 with a median around $1,829.
The observed spread is roughly $17,248 across tracked listings, which is about 93.1% 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 $1,829, 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 $17,248 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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