0.3 Carat Cushion Lab Grown Diamond Prices Comparison
As of April 2026, 0.3 carat cushion lab grown diamonds usually range from $126 to $768, with an average price of $294.In the last month, prices for these diamonds are flat -0%.Compare 38 verified listings across 3 retailers tracked by CaratRadar.
0.3 Carat Cushion Lab Grown Diamond Market Overview
CaratRadar currently tracks 38 verified 0.3-carat cushion lab grown diamonds listed across 3 online retailers. Prices in this segment range from $126 to $768, with an average asking price of $294 and a median of $178.
The price spread of $642 (83.6% 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.
38 diamonds tracked in this segment
Price range: $126 to $768
Average price: $294
Median price: $178
Available across 3 retailers
Savings potential: up to 83.6%
Price Range Overview
As of Apr 14, 2026Real market range for this carat, shape, and diamond type.
38
$126
$294
$178
$768
Price History
Price Comparison Matrix
Live Listings
See all listingsCompare current retailer offers for this exact segment and open any listing for full details.
IGI | 0.3ct | Cushion | D | VVS2 | Very Good
From $270
Compare at $285
Save 12.1%IGI | 0.31ct | Cushion | D | IF | Very Good
From $290
Compare at $330
Save 31%IGI | 0.31ct | Cushion | D | VS1 | Very Good
From $207
Compare at $300
Save 21.2%IGI | 0.31ct | Cushion | E | VVS2 | Ideal
From $237
Compare at $300
Save 27.1%IGI | 0.32ct | Cushion | D | VS1 | Good
From $226
Compare at $310
Save 31.1%IGI | 0.32ct | Cushion | D | VS1 | Fair
From $214
Compare at $310
Save 27.4%IGI | 0.33ct | Cushion | D | VS2 | Good
From $225
Compare at $310
Save 27.2%IGI | 0.33ct | Cushion | D | VS1 | Excellent
From $233
Compare at $320
Save 41%IGI | 0.33ct | Cushion | D | VS2 | Very Good
From $177
Compare at $300
Save 17.2%IGI | 0.34ct | Cushion | D | VVS1 | Excellent
From $290
Compare at $350
Save 29.1%IGI | 0.34ct | Cushion | D | VS1 | Very Good
From $227
Compare at $320
Save 13.8%IGI | 0.35ct | Cushion | D | VVS1 | Very Good
From $276
Compare at $320
Save 16.5%IGI | 0.36ct | Cushion | D | VVS2 | Ideal
From $292
Compare at $350
Save 24.3%IGI | 0.36ct | Cushion | E | VVS2 | Ideal
From $272
Compare at $360
Save 32.1%IGI | 0.36ct | Cushion | E | VS2 | Very Good
From $224
Compare at $330
Save 11.2%IGI | 0.36ct | Cushion | D | VVS1 | Very Good
From $293
Compare at $330
Save 27.3%IGI | 0.37ct | Cushion | E | VS1 | Good
From $247
Compare at $340
Save 11.4%IGI | 0.37ct | Cushion | D | IF | Very Good
From $346
Compare at $390
Save 29.9%IGI | 0.37ct | Cushion | E | VS1 | Very Good
From $259
Compare at $370
Save 14.5%IGI | 0.38ct | Cushion | D | VVS2 | Very Good
From $282
Compare at $330
Save 27.7%IGI | 0.39ct | Cushion | F | VVS2 | Excellent
From $260
Compare at $360
Save 27.8%IGI | 0.39ct | Cushion | D | VS1 | Good
From $260
Compare at $360
Save 14.5%IGI | 0.39ct | Cushion | D | VVS2 | Ideal
From $316
Compare at $370
Save 34.7%IGI | 0.4ct | Cushion | D | VS1 | Ideal
From $377
Compare at $577
Save 26.3%IGI | 0.4ct | Cushion | D | VVS1 | Ideal
From $361
Compare at $490
IGI | 0.4ct | Cushion | D | VVS2 | Excellent
From $265
Compare at $279
Save 36%IGI | 0.4ct | Cushion | E | VVS2 | Excellent
From $247
Compare at $386
Save 36.1%IGI | 0.4ct | Cushion | D | VS1 | Ideal
From $334
Compare at $523
Save 35.6%IGI | 0.4ct | Cushion | E | VVS1 | Ideal
From $490
Compare at $760
Save 37.3%IGI | 0.4ct | Cushion | D | VVS2 | Very Good
From $232
Compare at $370
IGI | 0.4ct | Cushion | D | VVS2 | Ideal
From $265
Compare at $279
Save 14.2%IGI | 0.4ct | Cushion | D | VS1 | Ideal
From $261
Compare at $304
Save 28.5%IGI | 0.4ct | Cushion | D | VVS2 | Excellent
From $270
Compare at $378
Save 15.6%IGI | 0.4ct | Cushion | E | IF | Very Good
From $376
Compare at $446
Save 12%IGI | 0.4ct | Cushion | D | VVS1 | Ideal
From $318
Compare at $362
IGI | 0.4ct | Cushion | D | VVS2 | Very Good
From $278
Compare at $298
Save 26.8%IGI | 0.4ct | Cushion | E | VVS1 | Very Good
From $296
Compare at $405
Save 14.4%IGI | 0.4ct | Cushion | D | VVS2 | Very Good
From $209
Compare at $244
Entry pricing in this category starts around $126.
What to Know When Shopping for 0.3 Carat Cushion Lab Grown Diamonds
- Always compare identical certified diamonds across retailers. Identical certificate numbers can have price differences of $642 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 $178 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 38 comparable stones in this segment. Prices start around $126 and go up to $768.
Based on the latest market data, the average asking price is about $294 with a median around $178.
The observed spread is roughly $642 across tracked listings, which is about 83.6% from highest to lowest offer in this bucket.
We refresh pricing data daily so these pages stay current with market changes.
Based on our data, the median price is $178, which represents the midpoint of the market. Anything below this figure from a reputable retailer is a solid deal.
We currently track this stone category across 3 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 $642 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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