0.3 Carat Cushion Lab Grown Diamond Prices Comparison
As of October 2026, 0.3 carat cushion lab grown diamonds in the 0.30–0.39 carat benchmark range usually range from $80 to $1,508, with an average price of $327.In the last month, prices for these diamonds are up 1.1%.Compare 187 verified listings across 6 retailers tracked by CaratRadar.
0.3 Carat Cushion Lab Grown Diamond Market Overview
CaratRadar currently tracks 187 verified 0.3-carat cushion lab grown diamonds in the 0.30–0.39 carat benchmark range, listed across 6 online retailers. Prices in this segment range from $80 to $1,508, with an average asking price of $327 and a median of $318.
The price spread of $1,428 (94.7% 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.
187 diamonds tracked in the 0.30–0.39 carat benchmark
Price range: $80 to $1,508
Average price: $327
Median price: $318
Available across 6 retailers
Savings potential: up to 94.7%
Price Range Overview
As of Oct 14, 2026Real market range for this carat, shape, and diamond type.
187
$80
$327
$318
$1,508
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 | 0.31ct | Cushion | D | VVS2 | Very Good
From $83
Compare at $358
Save 76.4%IGI | 0.33ct | Cushion | D | VS1 | Excellent
From $87
Compare at $369
Save 75.7%IGI | 0.33ct | Cushion | D | VVS2 | Very Good
From $89
Compare at $366
Save 39%IGI | 0.3ct | Cushion | D | VVS1 | Good
From $112
Compare at $184
Save 73.5%IGI | 0.33ct | Cushion | D | VS2 | Very Good
From $115
Compare at $434
Save 38.3%IGI | 0.35ct | Cushion | F | VS1 | Very Good
From $119
Compare at $193
Save 72.9%IGI | 0.31ct | Cushion | E | VVS2 | Ideal
From $122
Compare at $450
Save 72.9%IGI | 0.31ct | Cushion | D | VS1 | Very Good
From $122
Compare at $450
Save 70.8%IGI | 0.36ct | Cushion | D | VS1 | Very Good
From $125
Compare at $428
Save 61.8%IGI | 0.31ct | Cushion | D | VS1 | Good
From $126
Compare at $330
Save 72.5%IGI | 0.32ct | Cushion | E | VVS2 | Very Good
From $126
Compare at $459
Save 38.2%IGI | 0.36ct | Cushion | D | VS1 | Very Good
From $128
Compare at $207
Save 61.8%IGI | 0.32ct | Cushion | D | VS1 | Ideal
From $130
Compare at $340
Save 61.8%IGI | 0.32ct | Cushion | D | VS1 | Ideal
From $130
Compare at $340
Save 72.2%IGI | 0.33ct | Cushion | D | VS1 | Ideal
From $130
Compare at $468
Save 61.7%IGI | 0.34ct | Cushion | D | VS1 | Good
From $131
Compare at $342
Save 55.3%IGI | 0.4ct | Cushion | FANCY | VS1 | Good
From $131
Compare at $293
Save 61.7%IGI | 0.35ct | Cushion | D | VS2 | Ideal
From $132
Compare at $345
Save 70.1%IGI | 0.38ct | Cushion | D | VS1 | Excellent
From $132
Compare at $441
Save 70.2%IGI | 0.37ct | Cushion | E | VS1 | Ideal
From $133
Compare at $447
Save 38.5%IGI | 0.36ct | Cushion | D | VVS2 | Ideal
From $133
Compare at $216
Save 38.1%IGI | 0.34ct | Cushion | D | VVS2 | Excellent
From $134
Compare at $216
Save 61.5%IGI | 0.35ct | Cushion | D | VS1 | Ideal
From $135
Compare at $351
Save 61.5%IGI | 0.35ct | Cushion | D | VS1 | Ideal
From $135
Compare at $351
Save 61.6%IGI | 0.33ct | Cushion | E | VVS2 | Ideal
From $136
Compare at $354
Save 61.6%IGI | 0.32ct | Cushion | D | VVS2 | Excellent
From $137
Compare at $357
Save 49.3%IGI | 0.32ct | Cushion | D | VVS2 | Very Good
From $137
Compare at $270
Save 50.7%IGI | 0.36ct | Cushion | E | VS1 | Very Good
From $137
Compare at $278
Save 61.3%IGI | 0.34ct | Cushion | E | VVS2 | Excellent
From $138
Compare at $357
Save 61.4%IGI | 0.38ct | Cushion | D | SI1 | Ideal
From $139
Compare at $360
Save 61.5%IGI | 0.36ct | Cushion | D | VS1 | Ideal
From $139
Compare at $361
Save 61.5%IGI | 0.36ct | Cushion | D | VS1 | Excellent
From $139
Compare at $361
Save 37.9%IGI | 0.4ct | Cushion | D | VVS2 | Excellent
From $139
Compare at $224
Save 61.5%IGI | 0.34ct | Cushion | D | VVS2 | Ideal
From $140
Compare at $364
Save 61.5%IGI | 0.34ct | Cushion | D | VVS2 | Ideal
From $140
Compare at $364
Save 61.4%IGI | 0.37ct | Cushion | D | VS2 | Ideal
From $140
Compare at $363
Save 61.4%IGI | 0.37ct | Cushion | D | VS2 | Ideal
From $140
Compare at $363
Save 61.5%IGI | 0.34ct | Cushion | D | VVS2 | Excellent
From $140
Compare at $364
Save 61.5%IGI | 0.34ct | Cushion | D | VVS2 | Excellent
From $140
Compare at $364
Save 61.6%IGI | 0.33ct | Cushion | D | VVS2 | Ideal
From $141
Compare at $367
Save 61.6%IGI | 0.33ct | Cushion | D | VVS2 | Very Good
From $141
Compare at $367
Save 61%IGI | 0.36ct | Cushion | E | VVS2 | Ideal
From $142
Compare at $364
Save 69.4%IGI | 0.36ct | Cushion | D | VS1 | Very Good
From $142
Compare at $464
Save 69.5%IGI | 0.35ct | Cushion | D | VVS2 | Very Good
From $142
Compare at $466
Save 61.3%IGI | 0.35ct | Cushion | E | VVS2 | Ideal
From $142
Compare at $367
Save 61.4%IGI | 0.37ct | Cushion | D | VS1 | Ideal
From $143
Compare at $370
Save 61.4%IGI | 0.36ct | Cushion | E | VS1 | Very Good
From $143
Compare at $370
Save 61.4%IGI | 0.35ct | Cushion | D | VVS2 | Excellent
From $144
Compare at $373
Save 69.2%IGI | 0.37ct | Cushion | E | VS1 | Ideal
From $144
Compare at $468
Save 61.4%IGI | 0.35ct | Cushion | D | VVS2 | Very Good
From $144
Compare at $373
Entry pricing in this benchmark range starts around $80.
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 $1,428 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 $318 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 187 comparable stones in the 0.30–0.39 carat benchmark range. Prices start around $80 and go up to $1,508.
Based on the latest market data, the average asking price is about $327 with a median around $318.
The observed spread is roughly $1,428 across tracked listings, which is about 94.7% from highest to lowest offer in the 0.30–0.39 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 $327. The median price is $318, 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 6 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 $1,428 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 0.30–0.39 carat Cushion diamond benchmark.