4.5 Carat Cushion Lab Grown Diamond Prices Comparison
As of October 2026, 4.5 carat cushion lab grown diamonds in the 4.50–4.99 carat benchmark range usually range from $607 to $48,628, with an average price of $4,201.In the last month, prices for these diamonds are up 0.2%.Compare 985 verified listings across 15 retailers tracked by CaratRadar.
4.5 Carat Cushion Lab Grown Diamond Market Overview
CaratRadar currently tracks 985 verified 4.5-carat cushion lab grown diamonds in the 4.50–4.99 carat benchmark range, listed across 15 online retailers. Prices in this segment range from $607 to $48,628, with an average asking price of $4,201 and a median of $2,903.
The price spread of $48,021 (98.8% 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.
985 diamonds tracked in the 4.50–4.99 carat benchmark
Price range: $607 to $48,628
Average price: $4,201
Median price: $2,903
Available across 15 retailers
Savings potential: up to 98.8%
Price Range Overview
As of Oct 14, 2026Real market range for this carat, shape, and diamond type.
985
$607
$4,201
$2,903
$48,628
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 76.8%IGI | 4.59ct | Cushion | H | SI1 | Ideal
From $709
Compare at $3,060
Save 59.6%IGI | 4.52ct | Cushion | F | VS2 | Excellent
From $711
Compare at $1,759
Save 58.1%IGI | 4.5ct | Cushion | F | VS1 | Very Good
From $724
Compare at $1,729
Save 78.5%IGI | 4.73ct | Cushion | H | VS1 | Ideal
From $734
Compare at $3,410
Save 78.1%IGI | 4.52ct | Cushion | E | VS2 | Very Good
From $736
Compare at $3,368
Save 79%IGI | 4.53ct | Cushion | E | SI1 | Very Good
From $753
Compare at $3,580
Save 68.9%IGI | 4.73ct | Cushion | E | VS2 | Very Good
From $754
Compare at $2,427
Save 66.9%IGI | 4.54ct | Cushion | E | VS2 | Very Good
From $774
Compare at $2,336
Save 64.2%IGI | 4.54ct | Cushion | G | VS1 | Very Good
From $774
Compare at $2,165
Save 70.9%IGI | 4.57ct | Cushion | F | VS1 | Ideal
From $808
Compare at $2,777
Save 53.5%IGI | 4.51ct | Cushion | E | VS2 | Excellent
From $812
Compare at $1,746
Save 70.9%IGI | 4.59ct | Cushion | F | VS1 | Excellent
From $812
Compare at $2,789
Save 70.9%IGI | 4.59ct | Cushion | F | VS1 | Ideal
From $812
Compare at $2,789
Save 57.6%IGI | 4.52ct | Cushion | E | VS1 | Very Good
From $819
Compare at $1,930
Save 66.7%IGI | 4.83ct | Cushion | F | VS1 | Very Good
From $831
Compare at $2,499
Save 75.5%IGI | 4.7ct | Cushion | H | VS1 | Ideal
From $832
Compare at $3,390
Save 73.9%IGI | 4.5ct | Cushion | E | VS2 | Ideal
From $836
Compare at $3,197
Save 51.8%IGI | 4.52ct | Cushion | F | VS2 | Very Good
From $848
Compare at $1,759
Save 70.9%IGI | 4.59ct | Cushion | F | VVS2 | Ideal
From $851
Compare at $2,923
Save 70.9%IGI | 4.53ct | Cushion | F | VVS2 | Ideal
From $857
Compare at $2,944
Save 73.8%IGI | 4.78ct | Cushion | F | VS1 | Excellent
From $858
Compare at $3,270
Save 50.7%IGI | 4.5ct | Cushion | E | VS2 | Very Good
From $864
Compare at $1,752
Save 63.9%IGI | 4.51ct | Cushion | E | VS1 | Very Good
From $866
Compare at $2,400
Save 63.9%IGI | 4.52ct | Cushion | E | VVS2 | Excellent
From $868
Compare at $2,406
Save 63.9%IGI | 4.75ct | Cushion | G | VVS2 | Ideal
From $870
Compare at $2,409
Save 53.8%IGI | 4.51ct | Cushion | F | VVS2 | Very Good
From $870
Compare at $1,885
Save 79.2%IGI | 4.58ct | Cushion | G | VS1 | Very Good
From $879
Compare at $4,220
Save 70.9%IGI | 4.99ct | Cushion | F | VS1 | Very Good
From $881
Compare at $3,032
Save 40.8%IGI | 4.71ct | Cushion | E | VS1 | Ideal
From $881
Compare at $1,487
Save 79.4%IGI | 4.6ct | Cushion | G | VS1 | Very Good
From $883
Compare at $4,280
Save 76.8%IGI | 4.5ct | Cushion | F | VS2 | Very Good
From $884
Compare at $3,810
Save 77.1%IGI | 4.56ct | Cushion | F | VS2 | Excellent
From $885
Compare at $3,860
Save 63.9%IGI | 4.55ct | Cushion | F | VS1 | Ideal
From $886
Compare at $2,455
Save 78.7%IGI | 4.51ct | Cushion | G | VS1 | Ideal
From $890
Compare at $4,170
Save 70.9%IGI | 4.53ct | Cushion | E | VVS2 | Very Good
From $890
Compare at $3,062
Save 77.2%IGI | 4.65ct | Cushion | G | VS1 | Very Good
From $892
Compare at $3,910
Save 64.8%IGI | 4.59ct | Cushion | F | VS1 | Very Good
From $893
Compare at $2,535
Save 65.3%IGI | 4.55ct | Cushion | F | VS1 | Excellent
From $893
Compare at $2,573
Save 63.5%IGI | 4.53ct | Cushion | G | VS1 | Excellent
From $895
Compare at $2,453
Save 74.7%IGI | 4.69ct | Cushion | E | VS1 | Ideal
From $900
Compare at $3,555
Save 79.7%IGI | 4.5ct | Cushion | F | VS1 | Very Good
From $904
Compare at $4,460
Save 76.5%IGI | 4.55ct | Cushion | G | VS2 | Excellent
From $904
Compare at $3,850
Save 53.4%IGI | 4.51ct | Cushion | F | VS1 | Very Good
From $905
Compare at $1,942
Save 63.9%IGI | 4.9ct | Cushion | F | VS1 | Very Good
From $906
Compare at $2,510
Save 76.5%IGI | 4.58ct | Cushion | F | VS1 | Excellent
From $906
Compare at $3,849
Save 77%IGI | 4.6ct | Cushion | G | VS1 | Ideal
From $907
Compare at $3,950
Save 54.4%IGI | 4.57ct | Cushion | E | VS1 | Very Good
From $907
Compare at $1,988
Save 73.8%IGI | 4.5ct | Cushion | F | VS1 | Excellent
From $910
Compare at $3,468
Save 53%IGI | 4.57ct | Cushion | F | VVS2 | Excellent
From $910
Compare at $1,938
Save 55.4%IGI | 4.51ct | Cushion | E | VVS2 | Very Good
From $912
Compare at $2,047
Entry pricing in this benchmark range starts around $607.
What to Know When Shopping for 4.5 Carat Cushion Lab Grown Diamonds
- Always compare identical certified diamonds across retailers. Identical certificate numbers can have price differences of $48,021 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 $2,903 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 985 comparable stones in the 4.50–4.99 carat benchmark range. Prices start around $607 and go up to $48,628.
Based on the latest market data, the average asking price is about $4,201 with a median around $2,903.
The observed spread is roughly $48,021 across tracked listings, which is about 98.8% from highest to lowest offer in the 4.50–4.99 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 $4,201. The median price is $2,903, 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 15 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 $48,021 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 4.50–4.99 carat Cushion diamond benchmark.