4.5 Carat Cushion Lab Grown Diamond Prices Comparison
As of May 2026, 4.5 carat cushion lab grown diamonds usually range from $645 to $31,482, with an average price of $4,401.In the last month, prices for these diamonds are down 7.9%.Compare 320 verified listings across 9 retailers tracked by CaratRadar.
4.5 Carat Cushion Lab Grown Diamond Market Overview
CaratRadar currently tracks 320 verified 4.5-carat cushion lab grown diamonds listed across 9 online retailers. Prices in this segment range from $645 to $31,482, with an average asking price of $4,401 and a median of $3,029.
The price spread of $30,837 (98.0% 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.
320 diamonds tracked in this segment
Price range: $645 to $31,482
Average price: $4,401
Median price: $3,029
Available across 9 retailers
Savings potential: up to 98.0%
Price Range Overview
As of May 29, 2026Real market range for this carat, shape, and diamond type.
320
$645
$4,401
$3,029
$31,482
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 23.1%IGI | 4.51ct | Cushion | H | VS1 | Very Good
From $645
Compare at $839
Save 69.4%IGI | 4.51ct | Cushion | E | VS2 | Ideal
From $818
Compare at $2,677
Save 64.5%IGI | 4.55ct | Cushion | F | VS1 | Very Good
From $865
Compare at $2,436
Save 62.9%IGI | 4.5ct | Cushion | F | VS1 | Very Good
From $890
Compare at $2,397
Save 74.4%IGI | 4.59ct | Cushion | E | VS2 | Ideal
From $893
Compare at $3,485
Save 65.2%IGI | 4.52ct | Cushion | E | VS1 | Very Good
From $898
Compare at $2,584
Save 67.6%IGI | 4.59ct | Cushion | E | VS2 | Very Good
From $901
Compare at $2,781
Save 62.5%IGI | 4.56ct | Cushion | F | VS1 | Very Good
From $915
Compare at $2,443
Save 67.4%IGI | 4.52ct | Cushion | F | VS2 | Very Good
From $917
Compare at $2,812
Save 79.1%IGI | 4.52ct | Cushion | D | VS2 | Very Good
From $917
Compare at $4,380
Save 64.6%IGI | 4.52ct | Cushion | E | VS1 | Very Good
From $917
Compare at $2,588
Save 62%IGI | 4.51ct | Cushion | F | VS1 | Very Good
From $919
Compare at $2,416
Save 64.6%IGI | 4.53ct | Cushion | E | VS1 | Very Good
From $919
Compare at $2,599
Save 63.9%IGI | 4.51ct | Cushion | E | VS1 | Very Good
From $932
Compare at $2,581
Save 60.9%IGI | 4.53ct | Cushion | F | VVS2 | Very Good
From $932
Compare at $2,386
Save 78.8%IGI | 4.57ct | Cushion | D | VS2 | Ideal
From $937
Compare at $4,430
Save 61.1%IGI | 4.51ct | Cushion | F | VS1 | Very Good
From $938
Compare at $2,412
Save 65.6%IGI | 4.54ct | Cushion | E | VS2 | Very Good
From $940
Compare at $2,734
Save 72.7%IGI | 4.54ct | Cushion | E | VS1 | Ideal
From $944
Compare at $3,459
Save 79.1%IGI | 4.52ct | Cushion | F | VS2 | Ideal
From $948
Compare at $4,540
Save 64.5%IGI | 4.54ct | Cushion | G | VVS2 | Very Good
From $950
Compare at $2,677
Save 63.2%IGI | 4.53ct | Cushion | E | VS1 | Very Good
From $959
Compare at $2,609
Save 63%IGI | 4.53ct | Cushion | E | VS1 | Very Good
From $967
Compare at $2,610
Save 59.8%IGI | 4.53ct | Cushion | F | VS1 | Very Good
From $978
Compare at $2,430
Save 63.3%IGI | 4.58ct | Cushion | E | VS1 | Very Good
From $978
Compare at $2,666
Save 62.1%IGI | 4.51ct | Cushion | E | VVS2 | Very Good
From $983
Compare at $2,597
Save 71.1%IGI | 4.52ct | Cushion | D | VS2 | Very Good
From $985
Compare at $3,404
Save 63.1%IGI | 4.59ct | Cushion | E | VS1 | Very Good
From $989
Compare at $2,682
Save 62.2%IGI | 4.57ct | Cushion | E | VS2 | Ideal
From $1,006
Compare at $2,662
Save 61.6%IGI | 4.53ct | Cushion | E | VS1 | Very Good
From $1,006
Compare at $2,620
Save 62.5%IGI | 4.58ct | Cushion | G | VVS2 | Very Good
From $1,007
Compare at $2,683
Save 57.7%IGI | 4.5ct | Cushion | F | VVS2 | Very Good
From $1,010
Compare at $2,386
Save 57.7%IGI | 4.51ct | Cushion | F | VVS2 | Very Good
From $1,012
Compare at $2,395
Save 60.7%IGI | 4.5ct | Cushion | E | VS1 | Very Good
From $1,019
Compare at $2,592
Save 66.6%IGI | 4.59ct | Cushion | F | VVS2 | Ideal
From $1,021
Compare at $3,060
Save 23.8%IGI | 4.57ct | Cushion | E | VS1 | Very Good
From $1,023
Compare at $1,343
Save 61.5%IGI | 4.56ct | Cushion | E | VS1 | Very Good
From $1,023
Compare at $2,656
Save 62.5%IGI | 4.52ct | Cushion | E | VS2 | Very Good
From $1,024
Compare at $2,732
Save 61.6%IGI | 4.58ct | Cushion | E | VS1 | Very Good
From $1,027
Compare at $2,677
Save 60.4%IGI | 4.5ct | Cushion | E | VS1 | Very Good
From $1,028
Compare at $2,594
Save 58.5%IGI | 4.58ct | Cushion | F | VS1 | Very Good
From $1,029
Compare at $2,480
Save 60.7%IGI | 4.52ct | Cushion | E | VS1 | Very Good
From $1,031
Compare at $2,621
Save 60.4%IGI | 4.51ct | Cushion | F | VS1 | Very Good
From $1,032
Compare at $2,606
Save 58.4%IGI | 4.59ct | Cushion | F | VVS2 | Very Good
From $1,040
Compare at $2,501
Save 60.1%IGI | 4.53ct | Cushion | E | VVS2 | Very Good
From $1,053
Compare at $2,636
Save 59.2%IGI | 4.51ct | Cushion | E | VS1 | Very Good
From $1,060
Compare at $2,601
Save 60.3%IGI | 4.56ct | Cushion | E | VVS2 | Very Good
From $1,060
Compare at $2,669
Save 59.5%IGI | 4.51ct | Cushion | E | VVS2 | Very Good
From $1,064
Compare at $2,624
Save 60.5%IGI | 4.59ct | Cushion | E | VVS2 | Very Good
From $1,067
Compare at $2,702
Save 60.5%IGI | 4.59ct | Cushion | E | VVS2 | Very Good
From $1,067
Compare at $2,702
Entry pricing in this category starts around $645.
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 $30,837 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 $3,029 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 320 comparable stones in this segment. Prices start around $645 and go up to $31,482.
Based on the latest market data, the average asking price is about $4,401 with a median around $3,029.
The observed spread is roughly $30,837 across tracked listings, which is about 98.0% 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 $4,401. The median price is $3,029, 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 9 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 $30,837 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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