3.5 Carat Cushion Lab Grown Diamond Prices Comparison
As of October 2026, 3.5 carat cushion lab grown diamonds in the 3.50–3.99 carat benchmark range usually range from $474 to $26,931, with an average price of $3,182.In the last month, prices for these diamonds are down 1%.Compare 2,658 verified listings across 16 retailers tracked by CaratRadar.
3.5 Carat Cushion Lab Grown Diamond Market Overview
CaratRadar currently tracks 2,658 verified 3.5-carat cushion lab grown diamonds in the 3.50–3.99 carat benchmark range, listed across 16 online retailers. Prices in this segment range from $474 to $26,931, with an average asking price of $3,182 and a median of $2,260.
The price spread of $26,457 (98.2% 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 use the same benchmark range throughout the page and 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.
2,658 diamonds tracked in the 3.50–3.99 carat benchmark
Price range: $474 to $26,931
Average price: $3,182
Median price: $2,260
Available across 16 retailers
Savings potential: up to 98.2%
Price Range Overview
As of Oct 12, 2026Real market range for this carat, shape, and diamond type.
2,658
$474
$3,182
$2,260
$26,931
Price History
Price Comparison Matrix
Live Listings
See all listingsCompare current retailer offers in the same benchmark range and open any listing for full details.
Save 73.3%IGI | 3.53ct | Cushion | G | VS1 | Very Good
From $585
Compare at $2,194
Save 77.1%IGI | 3.53ct | Cushion | H | VS1 | Ideal
From $600
Compare at $2,620
IGI | 3.51ct | Cushion | J | VS2 | Ideal
From $614
Compare at $638
Save 16.4%IGI | 3.82ct | Cushion | K | VS1 | Very Good
From $617
Compare at $738
IGI | 3.52ct | Cushion | J | VS2 | Very Good
From $617
Compare at $641
Save 78.7%IGI | 3.51ct | Cushion | F | SI1 | Ideal
From $625
Compare at $2,940
Save 68.2%IGI | 3.51ct | Cushion | F | VS2 | Ideal
From $652
Compare at $2,052
Save 68.2%IGI | 3.53ct | Cushion | G | VVS2 | Very Good
From $655
Compare at $2,059
Save 65.7%IGI | 3.58ct | Cushion | G | VS1 | Ideal
From $665
Compare at $1,936
Save 77.3%IGI | 3.51ct | Cushion | F | SI1 | Very Good
From $668
Compare at $2,940
Save 51.8%IGI | 3.52ct | Cushion | F | VS1 | Very Good
From $670
Compare at $1,389
Save 65.8%IGI | 3.5ct | Cushion | G | VS1 | Very Good
From $670
Compare at $1,958
Save 70.6%IGI | 3.7ct | Cushion | E | VS1 | Ideal
From $683
Compare at $2,323
Save 70.1%IGI | 3.8ct | Cushion | F | VVS2 | Very Good
From $684
Compare at $2,288
Save 50.5%IGI | 3.51ct | Cushion | F | VS1 | Very Good
From $686
Compare at $1,387
Save 45.2%IGI | 3.93ct | Cushion | F | VS2 | Excellent
From $688
Compare at $1,256
Save 70.8%IGI | 3.52ct | Cushion | F | VVS2 | Ideal
From $688
Compare at $2,356
Save 73.7%IGI | 3.51ct | Cushion | H | VS1 | Excellent
From $690
Compare at $2,620
Save 66.4%IGI | 3.52ct | Cushion | F | VS2 | Very Good
From $690
Compare at $2,053
Save 56.3%IGI | 3.51ct | Cushion | E | VS1 | Very Good
From $692
Compare at $1,583
Save 66.2%IGI | 3.53ct | Cushion | F | VS2 | Very Good
From $695
Compare at $2,059
Save 70.8%IGI | 3.57ct | Cushion | F | VVS2 | Very Good
From $697
Compare at $2,390
Save 58.9%IGI | 3.51ct | Cushion | D | VS1 | Very Good
From $699
Compare at $1,700
Save 66.4%IGI | 3.72ct | Cushion | F | VS2 | Ideal
From $700
Compare at $2,085
Save 66.6%IGI | 3.55ct | Cushion | G | VS1 | Ideal
From $700
Compare at $2,095
Save 66.3%IGI | 3.52ct | Cushion | F | VS1 | Excellent
From $700
Compare at $2,078
Save 79.7%IGI | 3.52ct | Cushion | F | VS2 | Ideal
From $705
Compare at $3,480
Save 68.2%IGI | 3.54ct | Cushion | E | VVS2 | Very Good
From $705
Compare at $2,214
Save 69.8%IGI | 3.6ct | Cushion | F | VVS2 | Very Good
From $706
Compare at $2,335
Save 39.2%IGI | 3.55ct | Cushion | D | VS1 | Good
From $706
Compare at $1,162
Save 68.2%IGI | 3.55ct | Cushion | E | VVS2 | Very Good
From $706
Compare at $2,220
Save 75.2%IGI | 3.55ct | Cushion | H | VS1 | Excellent
From $706
Compare at $2,850
Save 66.6%IGI | 3.56ct | Cushion | G | VS2 | Very Good
From $710
Compare at $2,125
Save 79%IGI | 3.5ct | Cushion | G | VS1 | Very Good
From $710
Compare at $3,380
Save 80%IGI | 3.59ct | Cushion | G | VS1 | Excellent
From $714
Compare at $3,570
Save 78.7%IGI | 3.75ct | Cushion | G | VS1 | Ideal
From $715
Compare at $3,350
Save 59.7%IGI | 3.91ct | Cushion | F | SI2 | Very Good
From $715
Compare at $1,775
Save 66.8%IGI | 3.79ct | Cushion | H | VVS2 | Very Good
From $715
Compare at $2,151
Save 49.4%IGI | 3.54ct | Cushion | E | VS2 | Very Good
From $715
Compare at $1,412
Save 36.8%IGI | 3.58ct | Cushion | E | VS2 | Excellent
From $715
Compare at $1,132
Save 16.9%IGI | 3.63ct | Cushion | H | VS2 | Ideal
From $715
Compare at $860
Save 78.1%IGI | 3.51ct | Cushion | D | VS1 | Very Good
From $718
Compare at $3,284
Save 36.1%IGI | 3.5ct | Cushion | G | VS2 | Very Good
From $719
Compare at $1,125
Save 69%IGI | 3.54ct | Cushion | E | VS1 | Very Good
From $719
Compare at $2,316
Save 78.8%IGI | 3.6ct | Cushion | G | VS1 | Ideal
From $720
Compare at $3,400
Save 78.8%IGI | 3.6ct | Cushion | G | VS1 | Ideal
From $720
Compare at $3,400
Save 79.1%IGI | 3.57ct | Cushion | G | VS1 | Ideal
From $720
Compare at $3,450
Save 79.3%IGI | 3.59ct | Cushion | G | VS1 | Ideal
From $720
Compare at $3,470
Save 79.3%IGI | 3.59ct | Cushion | G | VS1 | Ideal
From $720
Compare at $3,470
Save 74%IGI | 3.94ct | Cushion | F | VS2 | Ideal
From $720
Compare at $2,774
Entry pricing in this benchmark range starts around $474.
What to Know When Shopping for 3.5 Carat Cushion Lab Grown Diamonds
- Always compare identical certified diamonds across retailers. Identical certificate numbers can have price differences of $26,457 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 $2,260 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 2,658 comparable stones in the 3.50–3.99 carat benchmark range. Prices start around $474 and go up to $26,931.
Based on the latest market data, the average asking price is about $3,182 with a median around $2,260.
The observed spread is roughly $26,457 across tracked listings, which is about 98.2% from highest to lowest offer in the 3.50–3.99 carat benchmark range.
We refresh pricing data daily so these pages stay current with market changes.
Based on completed market data, the fair market benchmark is $3,182. The median price is $2,260, 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 16 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 $26,457 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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Tracking Lab Grown inventory for the 3.50–3.99 carat Cushion diamond benchmark.