1.8 Carat Cushion Lab Grown Diamond Prices Comparison
As of May 2026, 1.8 carat cushion lab grown diamonds usually range from $236 to $6,500, with an average price of $1,328.In the last month, prices for these diamonds are down 5.8%.Compare 911 verified listings across 7 retailers tracked by CaratRadar.
1.8 Carat Cushion Lab Grown Diamond Market Overview
CaratRadar currently tracks 911 verified 1.8-carat cushion lab grown diamonds listed across 7 online retailers. Prices in this segment range from $236 to $6,500, with an average asking price of $1,328 and a median of $1,000.
The price spread of $6,264 (96.4% 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.
911 diamonds tracked in this segment
Price range: $236 to $6,500
Average price: $1,328
Median price: $1,000
Available across 7 retailers
Savings potential: up to 96.4%
Price Range Overview
As of May 30, 2026Real market range for this carat, shape, and diamond type.
911
$236
$1,328
$1,000
$6,500
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 45.1%IGI | 1.89ct | Cushion | G | VS1 | Very Good
From $275
Compare at $501
Save 79.4%IGI | 1.83ct | Cushion | F | VS1 | Very Good
From $275
Compare at $1,335
Save 79.4%IGI | 1.83ct | Cushion | F | VS1 | Very Good
From $275
Compare at $1,335
Save 79.7%IGI | 1.87ct | Cushion | F | VS1 | Very Good
From $277
Compare at $1,365
Save 79.4%IGI | 1.86ct | Cushion | F | VS1 | Ideal
From $279
Compare at $1,355
Save 79.4%IGI | 1.86ct | Cushion | F | VS1 | Excellent
From $279
Compare at $1,355
Save 65.7%IGI | 1.87ct | Cushion | G | VS1 | Very Good
From $289
Compare at $842
Save 46%IGI | 1.84ct | Cushion | F | VS1 | Very Good
From $289
Compare at $535
Save 45.9%IGI | 1.85ct | Cushion | E | VS2 | Very Good
From $291
Compare at $538
Save 69.3%IGI | 1.86ct | Cushion | E | VS1 | Very Good
From $292
Compare at $950
Save 69.3%IGI | 1.86ct | Cushion | E | VS1 | Very Good
From $292
Compare at $950
Save 45.9%IGI | 1.87ct | Cushion | F | VS1 | Ideal
From $294
Compare at $544
Save 69.4%IGI | 1.87ct | Cushion | E | VS1 | Very Good
From $294
Compare at $960
Save 66.5%IGI | 1.86ct | Cushion | G | VVS2 | Very Good
From $297
Compare at $887
Save 67.5%IGI | 1.81ct | Cushion | F | VS1 | Very Good
From $297
Compare at $915
Save 66.3%IGI | 1.82ct | Cushion | E | VS2 | Very Good
From $298
Compare at $885
Save 66.6%IGI | 1.85ct | Cushion | F | VS2 | Very Good
From $299
Compare at $895
Save 66.5%IGI | 1.84ct | Cushion | E | VS2 | Very Good
From $302
Compare at $902
Save 67%IGI | 1.87ct | Cushion | F | VS2 | Very Good
From $302
Compare at $914
Save 67%IGI | 1.88ct | Cushion | F | VS2 | Very Good
From $304
Compare at $922
Save 66.4%IGI | 1.88ct | Cushion | G | VVS2 | Very Good
From $304
Compare at $906
Save 67%IGI | 1.88ct | Cushion | F | VS2 | Very Good
From $304
Compare at $922
Save 68.3%IGI | 1.86ct | Cushion | F | VS1 | Very Good
From $305
Compare at $963
Save 66.4%IGI | 1.81ct | Cushion | E | VS1 | Very Good
From $305
Compare at $909
Save 66.4%IGI | 1.81ct | Cushion | E | VS1 | Very Good
From $305
Compare at $909
Save 67.3%IGI | 1.84ct | Cushion | E | VS1 | Very Good
From $306
Compare at $936
Save 67.2%IGI | 1.89ct | Cushion | F | VS2 | Very Good
From $306
Compare at $932
Save 70.9%IGI | 1.84ct | Cushion | E | VS1 | Very Good
From $306
Compare at $1,052
Save 67.5%IGI | 1.85ct | Cushion | E | VS1 | Very Good
From $308
Compare at $947
Save 67.7%IGI | 1.85ct | Cushion | F | VS1 | Very Good
From $308
Compare at $954
Save 67.2%IGI | 1.88ct | Cushion | E | VS2 | Very Good
From $308
Compare at $939
Save 67.9%IGI | 1.86ct | Cushion | F | VS1 | Very Good
From $309
Compare at $964
Save 67.7%IGI | 1.86ct | Cushion | E | VS1 | Very Good
From $309
Compare at $956
Save 67%IGI | 1.84ct | Cushion | E | VS1 | Very Good
From $310
Compare at $938
Save 67%IGI | 1.84ct | Cushion | E | VS1 | Very Good
From $310
Compare at $938
Save 67%IGI | 1.84ct | Cushion | E | VS1 | Very Good
From $310
Compare at $938
Save 68.1%IGI | 1.87ct | Cushion | F | VS1 | Very Good
From $311
Compare at $974
Save 67.8%IGI | 1.87ct | Cushion | E | VS1 | Very Good
From $311
Compare at $965
IGI | 1.87ct | Cushion | E | VS1 | Very Good
From $311
Compare at $965
Save 68.2%IGI | 1.85ct | Cushion | F | VVS2 | Very Good
From $312
Compare at $981
Save 67.1%IGI | 1.85ct | Cushion | E | VS1 | Very Good
From $312
Compare at $948
Save 67.1%IGI | 1.85ct | Cushion | E | VS1 | Very Good
From $312
Compare at $948
Save 67.1%IGI | 1.85ct | Cushion | E | VS1 | Very Good
From $312
Compare at $948
Save 67.9%IGI | 1.88ct | Cushion | E | VS1 | Very Good
From $313
Compare at $976
Save 67.9%IGI | 1.88ct | Cushion | E | VS1 | Very Good
From $313
Compare at $976
Save 68.2%IGI | 1.88ct | Cushion | F | VS1 | Very Good
From $313
Compare at $983
Save 67.9%IGI | 1.88ct | Cushion | E | VS1 | Very Good
From $313
Compare at $976
Save 67.9%IGI | 1.88ct | Cushion | E | VS1 | Very Good
From $313
Compare at $976
Save 67.9%IGI | 1.88ct | Cushion | E | VS1 | Very Good
From $313
Compare at $976
Save 67.9%IGI | 1.88ct | Cushion | E | VS1 | Very Good
From $313
Compare at $976
Entry pricing in this category starts around $236.
What to Know When Shopping for 1.8 Carat Cushion Lab Grown Diamonds
- Always compare identical certified diamonds across retailers. Identical certificate numbers can have price differences of $6,264 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 $1,000 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 911 comparable stones in this segment. Prices start around $236 and go up to $6,500.
Based on the latest market data, the average asking price is about $1,328 with a median around $1,000.
The observed spread is roughly $6,264 across tracked listings, which is about 96.4% 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 $1,328. The median price is $1,000, 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 7 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 $6,264 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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