0.4 Carat Cushion Lab Grown Diamond Prices Comparison
As of May 2026, 0.4 carat cushion lab grown diamonds usually range from $90 to $928, with an average price of $333.In the last month, prices for these diamonds are down 12.1%.Compare 421 verified listings across 4 retailers tracked by CaratRadar.
0.4 Carat Cushion Lab Grown Diamond Market Overview
CaratRadar currently tracks 421 verified 0.4-carat cushion lab grown diamonds listed across 4 online retailers. Prices in this segment range from $90 to $928, with an average asking price of $333 and a median of $308.
The price spread of $838 (90.3% 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.
421 diamonds tracked in this segment
Price range: $90 to $928
Average price: $333
Median price: $308
Available across 4 retailers
Savings potential: up to 90.3%
Price Range Overview
As of May 30, 2026Real market range for this carat, shape, and diamond type.
421
$90
$333
$308
$928
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 58.5%IGI | 0.45ct | Cushion | E | SI1 | Very Good
From $95
Compare at $229
Save 55.3%IGI | 0.43ct | Cushion | F | VS2 | Very Good
From $106
Compare at $237
Save 52.7%IGI | 0.49ct | Cushion | D | VS1 | Very Good
From $113
Compare at $239
Save 69.2%IGI | 0.41ct | Cushion | D | VS2 | Very Good
From $113
Compare at $367
Save 71.5%IGI | 0.49ct | Cushion | E | VS1 | Excellent
From $117
Compare at $410
Save 68.4%IGI | 0.42ct | Cushion | D | VS1 | Very Good
From $120
Compare at $380
Save 68.7%IGI | 0.45ct | Cushion | E | VS2 | Excellent
From $122
Compare at $390
Save 54.6%IGI | 0.43ct | Cushion | F | VVS2 | Very Good
From $124
Compare at $273
Save 58.8%IGI | 0.49ct | Cushion | D | VVS2 | Good
From $125
Compare at $303
Save 68.3%IGI | 0.47ct | Cushion | E | VS1 | Good
From $127
Compare at $400
Save 68%IGI | 0.47ct | Cushion | D | VVS2 | Ideal
From $128
Compare at $400
Save 65.4%IGI | 0.41ct | Cushion | D | VS1 | Ideal
From $128
Compare at $370
Save 68%IGI | 0.48ct | Cushion | D | VVS2 | Good
From $131
Compare at $410
Save 68.6%IGI | 0.49ct | Cushion | E | VS1 | Very Good
From $132
Compare at $420
Save 67.8%IGI | 0.46ct | Cushion | D | VS1 | Excellent
From $132
Compare at $410
Save 68.6%IGI | 0.49ct | Cushion | E | VS1 | Good
From $132
Compare at $420
Save 65.6%IGI | 0.43ct | Cushion | D | VS1 | Very Good
From $134
Compare at $390
Save 66.3%IGI | 0.45ct | Cushion | E | VS1 | Ideal
From $135
Compare at $400
Save 69.3%IGI | 0.49ct | Cushion | E | VVS2 | Good
From $137
Compare at $446
Save 65.8%IGI | 0.44ct | Cushion | E | VVS2 | Ideal
From $137
Compare at $400
Save 54.5%IGI | 0.44ct | Cushion | D | SI1 | Ideal
From $138
Compare at $304
Save 65.9%IGI | 0.45ct | Cushion | E | VVS2 | Ideal
From $140
Compare at $410
Save 54.4%IGI | 0.42ct | Cushion | D | VVS2 | Excellent
From $141
Compare at $309
Save 63.8%IGI | 0.42ct | Cushion | D | VS1 | Very Good
From $141
Compare at $390
Save 45.9%IGI | 0.45ct | Cushion | E | VS1 | Very Good
From $141
Compare at $261
Save 54.4%IGI | 0.42ct | Cushion | D | VVS2 | Ideal
From $141
Compare at $309
Save 54.5%IGI | 0.41ct | Cushion | D | VS1 | Ideal
From $142
Compare at $312
Save 54.5%IGI | 0.41ct | Cushion | D | VS1 | Ideal
From $142
Compare at $312
Save 67.7%IGI | 0.48ct | Cushion | D | VVS2 | Very Good
From $142
Compare at $440
Save 59.4%IGI | 0.42ct | Cushion | E | SI1 | Ideal
From $142
Compare at $350
Save 45.7%IGI | 0.48ct | Cushion | E | VS2 | Very Good
From $143
Compare at $263
Save 54.3%IGI | 0.42ct | Cushion | D | VS2 | Ideal
From $144
Compare at $315
Save 54.6%IGI | 0.46ct | Cushion | D | SI1 | Ideal
From $144
Compare at $317
Save 54.5%IGI | 0.43ct | Cushion | E | VS1 | Ideal
From $144
Compare at $316
Save 64.9%IGI | 0.46ct | Cushion | E | VVS2 | Ideal
From $144
Compare at $410
Save 65.7%IGI | 0.48ct | Cushion | E | VS1 | Ideal
From $144
Compare at $420
Save 64.9%IGI | 0.48ct | Cushion | E | VS1 | Excellent
From $144
Compare at $410
Save 54.3%IGI | 0.42ct | Cushion | D | VS1 | Excellent
From $146
Compare at $319
Save 67.6%IGI | 0.49ct | Cushion | D | VVS2 | Excellent
From $146
Compare at $450
Save 61.6%IGI | 0.44ct | Cushion | D | VS1 | Very Good
From $146
Compare at $380
Save 69.1%IGI | 0.48ct | Cushion | D | VS1 | Very Good
From $146
Compare at $473
Save 54.5%IGI | 0.49ct | Cushion | E | VS1 | Very Good
From $147
Compare at $323
Save 62.1%IGI | 0.45ct | Cushion | E | VS1 | Very Good
From $148
Compare at $390
Save 46%IGI | 0.45ct | Cushion | E | VS2 | Excellent
From $148
Compare at $274
Save 57.4%IGI | 0.41ct | Cushion | E | VS2 | Ideal
From $149
Compare at $350
Save 69.2%IGI | 0.49ct | Cushion | D | VS1 | Fair
From $149
Compare at $483
Save 69.2%IGI | 0.49ct | Cushion | D | VS1 | Very Good
From $149
Compare at $483
Save 69%IGI | 0.45ct | Cushion | D | VVS2 | Very Good
From $150
Compare at $484
Save 65.1%IGI | 0.48ct | Cushion | D | VS1 | Ideal
From $150
Compare at $430
Save 44.1%IGI | 0.45ct | Cushion | D | VVS2 | Ideal
From $151
Compare at $270
Entry pricing in this category starts around $90.
What to Know When Shopping for 0.4 Carat Cushion Lab Grown Diamonds
- Always compare identical certified diamonds across retailers. Identical certificate numbers can have price differences of $838 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 $308 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 421 comparable stones in this segment. Prices start around $90 and go up to $928.
Based on the latest market data, the average asking price is about $333 with a median around $308.
The observed spread is roughly $838 across tracked listings, which is about 90.3% 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 $333. The median price is $308, 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 4 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 $838 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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