6.4 Carat Cushion Lab Grown Diamond Prices Comparison
As of February 2026, 6.4 carat cushion lab grown diamonds usually range from $1,494 to $20,370, with an average price of $2,893.In the last month, prices for these diamonds are down 3.9%.Compare 51 verified listings across 6 retailers tracked by CaratRadar.
6.4 Carat Cushion Lab Grown Diamond Market Overview
CaratRadar currently tracks 51 verified 6.4-carat cushion lab grown diamonds listed across 6 online retailers. Prices in this segment range from $1,494 to $20,370, with an average asking price of $2,893 and a median of $1,958.
The price spread of $18,876 (92.7% 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.
51 diamonds tracked in this segment
Price range: $1,494 to $20,370
Average price: $2,893
Median price: $1,958
Available across 6 retailers
Savings potential: up to 92.7%
Price Range Overview
As of Feb 28, 2026Real market range for this carat, shape, and diamond type.
51
$1,494
$2,893
$1,958
$20,370
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 62.8%6.35ct | Cushion | E | VVS2 | Excellent
From $1,537
Compare at $4,132
IGISave 62.8%6.35ct | Cushion | E | VVS2 | Very Good
From $1,537
Compare at $4,132
IGISave 54.9%6.35ct | Cushion | E | VVS2 | Excellent
From $1,863
Compare at $4,132
IGISave 85.8%6.35ct | Cushion | E | VS1 | Good
From $2,262
Compare at $15,880
IGISave 79.3%6.35ct | Cushion | E | VVS2 | Excellent
From $2,186
Compare at $10,570
IGISave 86.8%6.35ct | Cushion | E | VS2 | Excellent
From $1,660
Compare at $12,550
IGISave 86.3%6.35ct | Cushion | E | VVS2 | Ideal
From $2,186
Compare at $15,940
IGISave 83.5%6.36ct | Cushion | F | VVS2 | Excellent
From $1,683
Compare at $10,170
IGISave 89.1%6.36ct | Cushion | E | VVS2 | Excellent
From $1,744
Compare at $15,970
IGISave 83.4%6.36ct | Cushion | G | VS1 | Very Good
From $1,859
Compare at $11,210
IGISave 60.9%6.37ct | Cushion | E | VS1 | Excellent
From $1,494
Compare at $3,824
GIASave 70.2%6.37ct | Cushion | E | VVS1 | Very Good
From $20,370
Compare at $68,297
IGISave 84.6%6.37ct | Cushion | D | VS1 | Excellent
From $2,530
Compare at $16,450
IGISave 59.8%6.37ct | Cushion | FANCY | VS1 | Very Good
From $1,705
Compare at $4,246
IGISave 85.4%6.37ct | Cushion | D | VS1 | Ideal
From $2,391
Compare at $16,330
IGISave 88.1%6.38ct | Cushion | F | VVS2 | Excellent
From $1,687
Compare at $14,220
IGISave 62%6.38ct | Cushion | FANCY | VS1 | Very Good
From $6,160
Compare at $16,214
IGISave 87.9%6.38ct | Cushion | F | VS1 | Very Good
From $1,597
Compare at $13,180
IGISave 84.7%6.39ct | Cushion | E | VVS2 | Ideal
From $2,478
Compare at $16,150
IGISave 84.7%6.39ct | Cushion | E | VVS2 | Ideal
From $2,478
Compare at $16,150
IGISave 80.7%6.39ct | Cushion | F | VVS1 | Ideal
From $8,147
Compare at $42,270
IGISave 87.8%6.39ct | Cushion | E | VS1 | Very Good
From $1,958
Compare at $15,980
IGISave 17.3%6.39ct | Cushion | G | SI1 | Very Good
From $2,924
Compare at $3,535
IGISave 89.1%6.39ct | Cushion | E | VVS2 | Excellent
From $1,751
Compare at $16,040
IGISave 74.3%6.4ct | Cushion | E | VS1 | Very Good
From $8,649
Compare at $33,680
IGISave 83.5%6.4ct | Cushion | D | VS1 | Ideal
From $2,710
Compare at $16,410
IGISave 74.9%6.4ct | Cushion | F | VVS1 | Ideal
From $3,819
Compare at $15,230
IGISave 85.3%6.4ct | Cushion | G | VS1 | Ideal
From $2,004
Compare at $13,600
IGISave 87.7%6.4ct | Cushion | E | VS1 | Excellent
From $1,960
Compare at $16,000
IGISave 84.4%6.4ct | Cushion | E | VVS2 | Very Good
From $2,523
Compare at $16,170
IGISave 65.1%6.41ct | Cushion | F | VS1 | Very Good
From $1,690
Compare at $4,843
IGISave 66.8%6.41ct | Cushion | F | VS1 | Ideal
From $3,133
Compare at $9,430
IGISave 33.9%6.41ct | Cushion | E | VS1 | Very Good
From $1,855
Compare at $2,806
IGISave 87.1%6.41ct | Cushion | E | VVS2 | Ideal
From $2,081
Compare at $16,090
IGISave 22.7%6.41ct | Cushion | E | VS1 | Very Good
From $1,861
Compare at $2,407
IGISave 27.5%6.41ct | Cushion | E | VVS2 | Very Good
From $1,880
Compare at $2,592
IGISave 88%6.42ct | Cushion | G | VS1 | Ideal
From $1,642
Compare at $13,640
IGISave 87.6%6.42ct | Cushion | F | VS1 | Excellent
From $1,635
Compare at $13,200
IGISave 29.5%6.42ct | Cushion | D | VS2 | Ideal
From $9,846
Compare at $13,970
IGISave 27%6.43ct | Cushion | E | VVS2 | Very Good
From $1,898
Compare at $2,600
IGISave 86.5%6.43ct | Cushion | E | VS1 | Ideal
From $2,153
Compare at $15,980
IGISave 88.1%6.43ct | Cushion | F | VVS2 | Excellent
From $1,699
Compare at $14,330
IGISave 40.3%6.43ct | Cushion | E | VVS2 | Very Good
From $1,553
Compare at $2,600
IGISave 84.4%6.43ct | Cushion | E | VVS2 | Very Good
From $2,535
Compare at $16,250
IGISave 87.6%6.43ct | Cushion | F | VS1 | Excellent
From $1,637
Compare at $13,230
IGISave 16.9%6.43ct | Cushion | E | VVS2 | Very Good
From $1,904
Compare at $2,290
IGISave 83.7%6.44ct | Cushion | D | VS1 | Ideal
From $2,695
Compare at $16,510
IGISave 40.4%6.44ct | Cushion | E | VVS2 | Very Good
From $1,568
Compare at $2,631
IGISave 83.6%6.45ct | Cushion | G | VVS2 | Ideal
From $2,095
Compare at $12,740
IGISave 84.9%6.45ct | Cushion | E | VVS2 | Very Good
From $2,438
Compare at $16,190
Entry pricing in this category starts around $1,494.
What to Know When Shopping for 6.4 Carat Cushion Lab Grown Diamonds
- Always compare identical certified diamonds across retailers. Identical certificate numbers can have price differences of $18,876 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 $1,958 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 51 comparable stones in this segment. Prices start around $1,494 and go up to $20,370.
Based on the latest market data, the average asking price is about $2,893 with a median around $1,958.
The observed spread is roughly $18,876 across tracked listings, which is about 92.7% 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 $1,958, 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 $18,876 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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