6.3 Carat Cushion Lab Grown Diamond Prices Comparison
As of May 2026, 6.3 carat cushion lab grown diamonds usually range from $845 to $36,909, with an average price of $4,585.In the last month, prices for these diamonds are down 7.1%.Compare 35 verified listings across 5 retailers tracked by CaratRadar.
6.3 Carat Cushion Lab Grown Diamond Market Overview
CaratRadar currently tracks 35 verified 6.3-carat cushion lab grown diamonds listed across 5 online retailers. Prices in this segment range from $845 to $36,909, with an average asking price of $4,585 and a median of $3,168.
The price spread of $36,064 (97.7% 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.
35 diamonds tracked in this segment
Price range: $845 to $36,909
Average price: $4,585
Median price: $3,168
Available across 5 retailers
Savings potential: up to 97.7%
Price Range Overview
As of May 29, 2026Real market range for this carat, shape, and diamond type.
35
$845
$4,585
$3,168
$36,909
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 66.6%IGI | 6.3ct | Cushion | E | VVS2 | Very Good
From $1,180
Compare at $3,532
Save 67.2%IGI | 6.4ct | Cushion | E | VVS2 | Very Good
From $1,195
Compare at $3,640
Save 65.9%IGI | 6.3ct | Cushion | E | VVS2 | Very Good
From $1,205
Compare at $3,532
Save 66.1%IGI | 6.34ct | Cushion | E | VVS2 | Excellent
From $1,213
Compare at $3,575
Save 66.1%IGI | 6.35ct | Cushion | E | VVS2 | Excellent
From $1,215
Compare at $3,585
Save 66.1%IGI | 6.35ct | Cushion | E | VVS2 | Very Good
From $1,215
Compare at $3,585
Save 66.1%IGI | 6.35ct | Cushion | E | VVS2 | Excellent
From $1,215
Compare at $3,585
Save 66.3%IGI | 6.38ct | Cushion | E | VVS2 | Excellent
From $1,221
Compare at $3,618
Save 72.3%IGI | 6.34ct | Cushion | E | VS1 | Ideal
From $1,334
Compare at $4,815
Save 73.5%IGI | 6.3ct | Cushion | D | VS2 | Ideal
From $1,686
Compare at $6,360
Save 71.9%IGI | 6.32ct | Cushion | D | VS1 | Ideal
From $1,814
Compare at $6,445
Save 64.4%IGI | 6.31ct | Cushion | D | VS1 | Very Good
From $1,900
Compare at $5,341
Save 64.4%IGI | 6.31ct | Cushion | D | VS1 | Very Good
From $1,900
Compare at $5,341
Save 70.5%IGI | 6.32ct | Cushion | D | VVS2 | Very Good
From $2,190
Compare at $7,416
Save 79.6%IGI | 6.31ct | Cushion | F | VS2 | Ideal
From $2,265
Compare at $11,130
Save 57.2%IGI | 6.33ct | Cushion | E | VS1 | Very Good
From $2,307
Compare at $5,395
Save 78.9%IGI | 6.33ct | Cushion | G | VS1 | Ideal
From $2,355
Compare at $11,160
Save 64.4%IGI | 6.37ct | Cushion | FANCY | VS1 | Very Good
From $2,384
Compare at $6,696
Save 37.9%IGI | 6.32ct | Cushion | E | VS1 | Excellent
From $2,513
Compare at $4,045
Save 60.6%IGI | 6.34ct | Cushion | D | VS1 | Ideal
From $2,547
Compare at $6,465
Save 13.1%IGI | 6.3ct | Cushion | E | VS1 | Very Good
From $2,757
Compare at $3,172
IGI | 6.34ct | Cushion | FANCY | VS2 | Excellent
From $2,925
Compare at $7,324
Save 76.6%GIA | 6.34ct | Cushion | E | VS2 | Ideal
From $2,936
Compare at $12,530
Save 77.3%IGI | 6.38ct | Cushion | FANCY | VS1 | Very Good
From $3,281
Compare at $14,446
Save 62.2%IGI | 6.35ct | Cushion | FANCY | VS2 | Good
From $3,327
Compare at $8,803
IGI | 6.39ct | Cushion | G | SI1 | Very Good
From $3,535
Compare at $3,916
IGI | 6.35ct | Cushion | FANCY | VS1 | Excellent
From $4,021
Compare at $10,637
IGI | 6.37ct | Cushion | D | VS1 | Very Good
From $4,231
Compare at $4,582
Save 46.3%GIA | 6.33ct | Cushion | E | VVS2 | Excellent
From $4,400
Compare at $8,189
Save 68.2%GIA | 6.33ct | Cushion | E | VVS2 | Ideal
From $5,063
Compare at $15,940
Save 78.2%GIA | 6.37ct | Cushion | E | VVS1 | Very Good
From $14,863
Compare at $68,297
Save 79.3%GIA | 6.33ct | Cushion | D | IF | Very Good
From $27,965
Compare at $135,100
Save 42%IGI | 6.3ct | Cushion | D | FL | Ideal
From $28,383
Compare at $48,940
Save 42%IGI | 6.32ct | Cushion | D | FL | Ideal
From $28,472
Compare at $49,090
Save 28.7%IGI | 6.3ct | Cushion | E | VVS2 | Very Good
From $437,088
Compare at $612,822
Entry pricing in this category starts around $845.
What to Know When Shopping for 6.3 Carat Cushion Lab Grown Diamonds
- Always compare identical certified diamonds across retailers. Identical certificate numbers can have price differences of $36,064 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 $3,168 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 35 comparable stones in this segment. Prices start around $845 and go up to $36,909.
Based on the latest market data, the average asking price is about $4,585 with a median around $3,168.
The observed spread is roughly $36,064 across tracked listings, which is about 97.7% 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 $4,585. The median price is $3,168, 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 5 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 $36,064 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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