4.5 Carat Cushion Lab Grown Diamond Prices Comparison
A 4.5 carat cushion lab grown diamond typically costs $2,916 (median of 951 listings at 17 online stores), with most between $1,158 and $11,304. Average prices rose 2.8% over the last month. Updated .
Average $4,209. Listings run from $607 to $49,354 in the 4.50–4.99 carat range.
See the live listings4.5 Carat Cushion Lab Grown Diamond Market Overview
CaratRadar currently tracks 951 verified 4.5-carat cushion lab grown diamonds in the 4.50–4.99 carat benchmark range, listed across 17 online retailers. Prices in this segment range from $607 to $49,354, with an average asking price of $4,209 and a median of $2,916.
Across this category, asking prices span $48,747 (98.8% from the most expensive to the cheapest listing). The same certified diamond can also be listed at different prices by different retailers, which is why CaratRadar compares stones by certificate number.
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.
951 diamonds tracked in the 4.50–4.99 carat benchmark
Price range: $607 to $49,354
Average price: $4,209
Median price: $2,916
Available across 17 retailers
Category price spread: 98.8%
Price Range Overview
As of Oct 22, 2026Real market range for this carat, shape, and diamond type.
951
$607
$4,209
$2,916
$49,354
Price History
Price Comparison Matrix
Compare nearby
Prices for the next carat weights, other shapes and the natural twin.
Nearby carat weights
Other shapes at 4.5 carat
- 4.5 carat round lab grown diamond pricesAverage $2,917
- 4.5 carat oval lab grown diamond pricesAverage $3,283
- 4.5 carat emerald lab grown diamond pricesAverage $3,169
- 4.5 carat pear lab grown diamond pricesAverage $3,042
- 4.5 carat radiant lab grown diamond pricesAverage $2,872
- 4.5 carat marquise lab grown diamond pricesAverage $3,344
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 69.8%IGI | 4.52ct | Cushion | F | VS2 | Excellent
From $711
Compare at $2,352
Save 58.1%IGI | 4.5ct | Cushion | F | VS1 | Very Good
From $724
Compare at $1,729
Save 70.1%IGI | 4.55ct | Cushion | F | VS1 | Ideal
From $733
Compare at $2,455
Save 77.8%IGI | 4.73ct | Cushion | H | VS1 | Ideal
From $735
Compare at $3,310
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 70.3%IGI | 4.52ct | Cushion | F | VS1 | Excellent
From $753
Compare at $2,532
Save 68.9%IGI | 4.73ct | Cushion | E | VS2 | Very Good
From $754
Compare at $2,427
Save 64.2%IGI | 4.54ct | Cushion | G | VS1 | Very Good
From $774
Compare at $2,165
Save 79.9%IGI | 4.59ct | Cushion | G | VS2 | Ideal
From $782
Compare at $3,890
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 78.2%IGI | 4.5ct | Cushion | E | VS1 | Very Good
From $817
Compare at $3,743
Save 75.5%IGI | 4.52ct | Cushion | F | VS1 | Very Good
From $817
Compare at $3,329
Save 57.6%IGI | 4.52ct | Cushion | E | VS1 | Very Good
From $819
Compare at $1,930
Save 69.7%IGI | 4.53ct | Cushion | F | VVS2 | Ideal
From $823
Compare at $2,713
Save 66.7%IGI | 4.83ct | Cushion | F | VS1 | Very Good
From $831
Compare at $2,499
Save 74.6%IGI | 4.7ct | Cushion | H | VS1 | Ideal
From $835
Compare at $3,290
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 78.2%IGI | 4.52ct | Cushion | F | VVS2 | Ideal
From $854
Compare at $3,916
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 78.2%IGI | 4.54ct | Cushion | F | VVS2 | Very Good
From $858
Compare at $3,933
Save 63.9%IGI | 4.75ct | Cushion | G | VVS2 | Ideal
From $859
Compare at $2,381
Save 78.2%IGI | 4.56ct | Cushion | E | VS1 | Very Good
From $862
Compare at $3,951
Save 78.2%IGI | 4.56ct | Cushion | E | VS1 | Ideal
From $862
Compare at $3,951
Save 50.7%IGI | 4.5ct | Cushion | E | VS2 | Very Good
From $864
Compare at $1,752
Save 38.9%IGI | 4.57ct | Cushion | E | VVS2 | Ideal
From $864
Compare at $1,413
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 53.8%IGI | 4.51ct | Cushion | F | VVS2 | Very Good
From $870
Compare at $1,885
Save 69.6%IGI | 4.56ct | Cushion | E | VVS2 | Very Good
From $870
Compare at $2,861
Save 65.4%IGI | 4.56ct | Cushion | F | VS1 | Excellent
From $875
Compare at $2,531
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 77.1%IGI | 4.58ct | Cushion | F | VS1 | Excellent
From $881
Compare at $3,849
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 79%IGI | 4.53ct | Cushion | G | VVS2 | Excellent
From $885
Compare at $4,216
Save 54.4%IGI | 4.51ct | Cushion | F | VS1 | Very Good
From $886
Compare at $1,942
Save 51.1%IGI | 4.62ct | Cushion | F | VS1 | Excellent
From $887
Compare at $1,815
Save 70.9%IGI | 4.51ct | Cushion | E | VVS2 | Ideal
From $887
Compare at $3,048
Save 70.9%IGI | 4.53ct | Cushion | E | VVS2 | Very Good
From $890
Compare at $3,062
Save 78.4%IGI | 4.51ct | Cushion | G | VS1 | Ideal
From $900
Compare at $4,170
Save 78.4%IGI | 4.72ct | Cushion | E | VVS2 | Ideal
From $904
Compare at $4,192
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, because the same certificate can be listed at different prices by different stores. Across this whole category, asking prices span $48,747 from the cheapest to the most expensive listing.
- 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 $2,916 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 951 comparable stones in the 4.50–4.99 carat benchmark range. Prices start around $607 and go up to $49,354.
Based on the latest market data, the average asking price is about $4,209 with a median around $2,916.
The observed spread is roughly $48,747 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 $4,209. The median price is $2,916, 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 17 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. Across this category, asking prices span $48,747 from the cheapest to the most expensive listing, and the same certified diamond can also carry different prices at different 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.
Tools and Guides
Tracking Lab Grown inventory for the 4.50–4.99 carat Cushion diamond benchmark.