1.8 Carat Cushion Lab Grown Diamond Prices Comparison
As of February 2026, 1.8 carat cushion lab grown diamonds usually range from $457 to $4,980, with an average price of $788.In the last month, prices for these diamonds are down 3.3%.Compare 1,421 verified listings across 10 retailers tracked by CaratRadar.
1.8 Carat Cushion Lab Grown Diamond Market Overview
CaratRadar currently tracks 1,421 verified 1.8-carat cushion lab grown diamonds listed across 10 online retailers. Prices in this segment range from $457 to $4,980, with an average asking price of $788 and a median of $649.
The price spread of $4,523 (90.8% 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.
1,421 diamonds tracked in this segment
Price range: $457 to $4,980
Average price: $788
Median price: $649
Available across 10 retailers
Savings potential: up to 90.8%
Price Range Overview
As of Feb 28, 2026Real market range for this carat, shape, and diamond type.
1,421
$457
$788
$649
$4,980
Price History
Price Comparison Matrix
Live Listings
See all listingsCompare current retailer offers for this exact segment and open any listing for full details.
IGISave 72%1.75ct | Cushion | F | SI1 | Very Good
From $602
Compare at $2,150
IGISave 71.9%1.75ct | Cushion | G | VVS2 | Very Good
From $624
Compare at $2,220
IGISave 71.9%1.75ct | Cushion | G | VS2 | Very Good
From $610
Compare at $2,170
IGISave 71.9%1.75ct | Cushion | G | VS1 | Very Good
From $624
Compare at $2,220
IGISave 31.4%1.75ct | Cushion | D | VS1 | Ideal
From $777
Compare at $1,132
IGISave 76.5%1.75ct | Cushion | E | VS1 | Ideal
From $745
Compare at $3,170
IGISave 81.3%1.75ct | Cushion | E | VVS2 | Ideal
From $615
Compare at $3,290
GIASave 70.4%1.75ct | Cushion | E | VS2 | Excellent
From $841
Compare at $2,840
GIASave 74%1.75ct | Cushion | E | VVS2 | Ideal
From $1,609
Compare at $6,200
IGISave 80.7%1.75ct | Cushion | G | VS1 | Ideal
From $576
Compare at $2,990
IGISave 71.2%1.75ct | Cushion | F | VVS2 | Very Good
From $740
Compare at $2,570
IGISave 77.6%1.75ct | Cushion | G | VVS2 | Very Good
From $556
Compare at $2,480
IGISave 65.4%1.75ct | Cushion | G | VS1 | Ideal
From $588
Compare at $1,700
IGISave 71.9%1.75ct | Cushion | G | VVS2 | Very Good
From $624
Compare at $2,220
IGISave 81.4%1.75ct | Cushion | E | VVS2 | Ideal
From $656
Compare at $3,520
IGISave 80.8%1.75ct | Cushion | E | VS1 | Ideal
From $609
Compare at $3,170
IGISave 75.9%1.75ct | Cushion | E | VS1 | Very Good
From $704
Compare at $2,920
IGISave 80.9%1.75ct | Cushion | F | VVS2 | Ideal
From $523
Compare at $2,740
IGISave 29%1.75ct | Cushion | F | VVS2 | Very Good
From $752
Compare at $1,059
IGISave 83.3%1.75ct | Cushion | D | VVS2 | Ideal
From $639
Compare at $3,820
IGISave 73.3%1.75ct | Cushion | D | VS1 | Ideal
From $847
Compare at $3,180
IGISave 82.2%1.75ct | Cushion | E | VVS2 | Ideal
From $626
Compare at $3,520
IGISave 73.6%1.75ct | Cushion | E | VVS1 | Ideal
From $790
Compare at $2,990
IGISave 64%1.75ct | Cushion | D | VVS2 | Very Good
From $1,198
Compare at $3,324
IGISave 76.7%1.75ct | Cushion | D | VS1 | Ideal
From $663
Compare at $2,850
IGISave 66.8%1.75ct | Cushion | D | IF | Ideal
From $2,012
Compare at $6,060
IGISave 62.9%1.75ct | Cushion | E | VVS2 | Very Good
From $606
Compare at $1,633
IGISave 64.8%1.75ct | Cushion | F | VVS2 | Very Good
From $668
Compare at $1,900
IGISave 16.6%1.75ct | Cushion | D | VVS2 | Very Good
From $671
Compare at $805
IGISave 71.4%1.75ct | Cushion | E | VVS2 | Very Good
From $663
Compare at $2,320
GIASave 65.1%1.75ct | Cushion | E | VVS2 | Excellent
From $994
Compare at $2,850
GIASave 82.2%1.75ct | Cushion | F | VS2 | Excellent
From $705
Compare at $3,970
GIASave 72.8%1.75ct | Cushion | E | VVS2 | Excellent
From $940
Compare at $3,450
IGISave 61.8%1.75ct | Cushion | G | VS2 | Very Good
From $1,375
Compare at $3,597
IGISave 72.5%1.75ct | Cushion | E | SI1 | Very Good
From $541
Compare at $1,970
IGISave 65.7%1.75ct | Cushion | D | VS1 | Ideal
From $799
Compare at $2,331
IGISave 78.9%1.75ct | Cushion | F | VS1 | Ideal
From $483
Compare at $2,290
IGISave 44.7%1.75ct | Cushion | D | VS1 | Ideal
From $626
Compare at $1,132
IGISave 75%1.75ct | Cushion | E | VS2 | Ideal
From $539
Compare at $2,160
IGISave 80.8%1.75ct | Cushion | E | VS1 | Ideal
From $609
Compare at $3,170
IGISave 75.9%1.75ct | Cushion | E | VS2 | Ideal
From $713
Compare at $2,960
IGISave 31.3%1.75ct | Cushion | E | VS2 | Ideal
From $713
Compare at $1,038
IGISave 81.5%1.75ct | Cushion | D | VS1 | Very Good
From $716
Compare at $3,870
IGISave 73.2%1.75ct | Cushion | E | VS1 | Ideal
From $980
Compare at $3,650
IGISave 55.3%1.75ct | Cushion | D | VVS2 | Ideal
From $597
Compare at $1,336
IGISave 86.7%1.75ct | Cushion | D | VVS2 | Ideal
From $500
Compare at $3,770
IGISave 48.3%1.75ct | Cushion | D | VVS2 | Ideal
From $660
Compare at $1,278
IGISave 35.9%1.75ct | Cushion | D | VVS1 | Very Good
From $559
Compare at $872
IGISave 73.8%1.75ct | Cushion | E | VS1 | Ideal
From $575
Compare at $2,200
IGISave 71.7%1.75ct | Cushion | E | VS1 | Ideal
From $826
Compare at $2,920
Entry pricing in this category starts around $457.
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 $4,523 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 $649 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 1,421 comparable stones in this segment. Prices start around $457 and go up to $4,980.
Based on the latest market data, the average asking price is about $788 with a median around $649.
The observed spread is roughly $4,523 across tracked listings, which is about 90.8% 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 $649, 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 10 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 $4,523 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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