6.6 Carat Cushion Lab Grown Diamond Prices Comparison
As of May 2026, 6.6 carat cushion lab grown diamonds usually range from $920 to $48,203, with an average price of $5,641.In the last month, prices for these diamonds are down 9.5%.Compare 46 verified listings across 4 retailers tracked by CaratRadar.
6.6 Carat Cushion Lab Grown Diamond Market Overview
CaratRadar currently tracks 46 verified 6.6-carat cushion lab grown diamonds listed across 4 online retailers. Prices in this segment range from $920 to $48,202, with an average asking price of $5,641 and a median of $3,837.
The price spread of $47,282 (98.1% 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.
46 diamonds tracked in this segment
Price range: $920 to $48,202
Average price: $5,641
Median price: $3,837
Available across 4 retailers
Savings potential: up to 98.1%
Price Range Overview
As of May 31, 2026Real market range for this carat, shape, and diamond type.
46
$920
$5,641
$3,837
$48,203
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 69.5%IGI | 6.64ct | Cushion | G | SI1 | Very Good
From $1,120
Compare at $3,669
Save 68.5%IGI | 6.68ct | Cushion | F | VVS2 | Very Good
From $1,165
Compare at $3,702
Save 68%IGI | 6.65ct | Cushion | F | VVS2 | Very Good
From $1,175
Compare at $3,673
Save 68.3%IGI | 6.6ct | Cushion | E | VVS2 | Very Good
From $1,225
Compare at $3,860
Save 68.3%IGI | 6.6ct | Cushion | E | VVS2 | Very Good
From $1,225
Compare at $3,860
Save 67.1%IGI | 6.7ct | Cushion | E | VS1 | Very Good
From $1,230
Compare at $3,737
Save 68.7%IGI | 6.68ct | Cushion | E | VVS2 | Very Good
From $1,235
Compare at $3,949
Save 68.6%IGI | 6.67ct | Cushion | E | VVS2 | Very Good
From $1,235
Compare at $3,938
Save 68.8%IGI | 6.7ct | Cushion | E | VVS2 | Very Good
From $1,240
Compare at $3,972
Save 68.8%IGI | 6.7ct | Cushion | E | VVS2 | Very Good
From $1,240
Compare at $3,972
Save 68.7%IGI | 6.69ct | Cushion | E | VVS2 | Very Good
From $1,240
Compare at $3,960
Save 68.8%IGI | 6.7ct | Cushion | E | VVS2 | Very Good
From $1,240
Compare at $3,972
Save 66.8%IGI | 6.69ct | Cushion | E | VS1 | Very Good
From $1,240
Compare at $3,730
Save 65.8%IGI | 6.64ct | Cushion | E | VS1 | Very Good
From $1,255
Compare at $3,674
Save 67.3%IGI | 6.6ct | Cushion | E | VVS2 | Very Good
From $1,261
Compare at $3,860
Save 67.5%IGI | 6.64ct | Cushion | E | VVS2 | Excellent
From $1,268
Compare at $3,904
Save 67.5%IGI | 6.64ct | Cushion | E | VVS2 | Very Good
From $1,268
Compare at $3,904
Save 67.6%IGI | 6.67ct | Cushion | E | VVS2 | Very Good
From $1,274
Compare at $3,938
Save 67.6%IGI | 6.67ct | Cushion | E | VVS2 | Very Good
From $1,274
Compare at $3,938
Save 67.8%IGI | 6.7ct | Cushion | E | VVS2 | Very Good
From $1,279
Compare at $3,972
Save 75.2%IGI | 6.62ct | Cushion | E | VS2 | Ideal
From $1,340
Compare at $5,407
Save 75.1%IGI | 6.7ct | Cushion | F | VS2 | Very Good
From $1,343
Compare at $5,400
Save 75.2%IGI | 6.68ct | Cushion | E | VS2 | Ideal
From $1,365
Compare at $5,510
Save 75%IGI | 6.69ct | Cushion | E | VS1 | Ideal
From $1,406
Compare at $5,626
Save 75.2%IGI | 6.69ct | Cushion | E | VS1 | Ideal
From $1,406
Compare at $5,680
Save 63.8%IGI | 6.7ct | Cushion | F | VS1 | Ideal
From $1,408
Compare at $3,886
Save 54.8%IGI | 6.6ct | Cushion | F | VVS2 | Excellent
From $1,635
Compare at $3,621
Save 55.1%IGI | 6.63ct | Cushion | F | VVS2 | Excellent
From $1,640
Compare at $3,652
Save 55.4%IGI | 6.7ct | Cushion | F | VVS2 | Excellent
From $1,660
Compare at $3,726
Save 57.1%IGI | 6.65ct | Cushion | E | VVS2 | Ideal
From $1,720
Compare at $4,013
Save 67%IGI | 6.68ct | Cushion | F | VS2 | Ideal
From $1,760
Compare at $5,328
Save 76.1%IGI | 6.69ct | Cushion | D | VS2 | Ideal
From $1,788
Compare at $7,466
Save 68.3%IGI | 6.6ct | Cushion | F | SI1 | Ideal
From $1,973
Compare at $6,222
Save 72.9%IGI | 6.7ct | Cushion | FANCY | VS2 | Very Good
From $2,000
Compare at $7,368
Save 78.7%IGI | 6.66ct | Cushion | E | VVS2 | Ideal
From $2,068
Compare at $9,700
Save 29%IGI | 6.6ct | Cushion | F | VVS2 | Very Good
From $2,107
Compare at $2,966
Save 26.8%IGI | 6.6ct | Cushion | E | VS1 | Very Good
From $2,178
Compare at $2,975
Save 77.8%IGI | 6.63ct | Cushion | F | VVS1 | Ideal
From $2,316
Compare at $10,443
Save 74.9%IGI | 6.61ct | Cushion | G | VS1 | Ideal
From $2,563
Compare at $10,220
Save 74.9%IGI | 6.61ct | Cushion | G | VS1 | Ideal
From $2,563
Compare at $10,220
Save 74.9%IGI | 6.63ct | Cushion | G | VS1 | Ideal
From $2,570
Compare at $10,250
Save 74.9%IGI | 6.69ct | Cushion | G | VS1 | Ideal
From $2,592
Compare at $10,340
Save 74.9%IGI | 6.7ct | Cushion | G | VS1 | Ideal
From $2,596
Compare at $10,350
Save 77.5%GIA | 6.66ct | Cushion | F | VS1 | Ideal
From $3,083
Compare at $13,700
Save 30.1%IGI | 6.61ct | Cushion | E | VS1 | Ideal
From $3,212
Compare at $4,596
Save 67.1%IGI | 6.68ct | Cushion | FANCY | VS2 | Excellent
From $3,380
Compare at $10,263
Entry pricing in this category starts around $920.
What to Know When Shopping for 6.6 Carat Cushion Lab Grown Diamonds
- Always compare identical certified diamonds across retailers. Identical certificate numbers can have price differences of $47,282 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 $3,837 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.
- Cushion cuts come in standard and modified brilliant varieties. Modified brilliants tend to show more fire, while standard cushions have broader facets.
Frequently Asked Questions
We currently track 46 comparable stones in this segment. Prices start around $920 and go up to $48,202.
Based on the latest market data, the average asking price is about $5,641 with a median around $3,837.
The observed spread is roughly $47,282 across tracked listings, which is about 98.1% from highest to lowest offer in this bucket.
We refresh pricing data daily so these pages stay current with market changes.
Based on completed market data, the fair market benchmark is $5,641. The median price is $3,837, 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 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 $47,282 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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