5.9 Carat Cushion Lab Grown Diamond Prices Comparison
As of February 2026, 5.9 carat cushion lab grown diamonds usually range from $1,297 to $17,400, with an average price of $3,000.In the last month, prices for these diamonds are down 1.3%.Compare 35 verified listings across 6 retailers tracked by CaratRadar.
5.9 Carat Cushion Lab Grown Diamond Market Overview
CaratRadar currently tracks 35 verified 5.9-carat cushion lab grown diamonds listed across 6 online retailers. Prices in this segment range from $1,297 to $17,400, with an average asking price of $3,000 and a median of $2,101.
The price spread of $16,103 (92.5% 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.
35 diamonds tracked in this segment
Price range: $1,297 to $17,400
Average price: $3,000
Median price: $2,101
Available across 6 retailers
Savings potential: up to 92.5%
Price Range Overview
As of Feb 28, 2026Real market range for this carat, shape, and diamond type.
35
$1,297
$3,000
$2,101
$17,400
Price History
Price Comparison Matrix
Live Listings
See all listingsCompare current retailer offers for this exact segment and open any listing for full details.
GIASave 56.1%5.85ct | Cushion | F | VS2 | Ideal
From $8,075
Compare at $18,390
IGISave 70.3%5.85ct | Cushion | D | VVS2 | Very Good
From $2,101
Compare at $7,075
IGISave 81.3%5.85ct | Cushion | E | VS1 | Very Good
From $2,129
Compare at $11,370
IGISave 42.2%5.85ct | Cushion | F | VVS2 | Very Good
From $1,298
Compare at $2,245
IGISave 72.1%5.85ct | Cushion | D | VVS2 | Ideal
From $5,059
Compare at $18,120
IGISave 86.9%5.86ct | Cushion | F | VS1 | Ideal
From $1,757
Compare at $13,370
IGISave 86.9%5.86ct | Cushion | F | VS1 | Ideal
From $1,757
Compare at $13,370
IGISave 80.9%5.86ct | Cushion | F | VVS2 | Very Good
From $2,153
Compare at $11,290
IGISave 80%5.86ct | Cushion | E | VVS2 | Very Good
From $2,341
Compare at $11,690
IGISave 86.9%5.86ct | Cushion | F | VS1 | Ideal
From $1,757
Compare at $13,370
IGISave 83.8%5.87ct | Cushion | F | VS1 | Ideal
From $2,175
Compare at $13,390
IGISave 72.1%5.87ct | Cushion | D | VVS1 | Very Good
From $5,408
Compare at $19,410
IGISave 84.2%5.87ct | Cushion | F | VVS2 | Ideal
From $1,297
Compare at $8,210
IGISave 83.7%5.88ct | Cushion | E | VS2 | Very Good
From $1,886
Compare at $11,580
IGISave 84.6%5.88ct | Cushion | G | VS2 | Ideal
From $1,673
Compare at $10,850
IGISave 69.9%5.88ct | Cushion | FANCY | VVS1 | Very Good
From $6,996
Compare at $23,207
GIASave 19.1%5.89ct | Cushion | E | VS1 | Good
From $17,400
Compare at $21,518
IGISave 88.3%5.89ct | Cushion | E | VS1 | Very Good
From $1,714
Compare at $14,650
IGISave 72.1%5.89ct | Cushion | E | VS2 | Ideal
From $1,329
Compare at $4,770
IGISave 79.7%5.89ct | Cushion | E | VVS2 | Excellent
From $1,981
Compare at $9,751
IGISave 88.1%5.89ct | Cushion | E | VS1 | Good
From $1,744
Compare at $14,650
IGISave 84.9%5.9ct | Cushion | F | VVS2 | Ideal
From $2,261
Compare at $15,020
IGISave 82.4%5.9ct | Cushion | E | VVS2 | Ideal
From $2,582
Compare at $14,710
IGISave 83.7%5.9ct | Cushion | F | VS1 | Ideal
From $2,186
Compare at $13,450
IGISave 74.8%5.91ct | Cushion | F | VVS2 | Ideal
From $2,412
Compare at $9,590
IGISave 66.7%5.91ct | Cushion | FANCY | VS1 | Very Good
From $5,591
Compare at $16,807
IGISave 78.8%5.92ct | Cushion | F | VS1 | Excellent
From $2,174
Compare at $10,250
IGISave 83.7%5.92ct | Cushion | E | VS2 | Ideal
From $1,898
Compare at $11,660
IGISave 54.4%5.92ct | Cushion | F | VS1 | Very Good
From $3,229
Compare at $7,088
IGISave 85.7%5.92ct | Cushion | F | VVS2 | Excellent
From $1,885
Compare at $13,220
IGISave 87.8%5.92ct | Cushion | E | VS2 | Ideal
From $1,420
Compare at $11,660
IGISave 82.8%5.93ct | Cushion | G | SI1 | Very Good
From $1,430
Compare at $8,320
IGISave 76.1%5.94ct | Cushion | G | VS2 | Very Good
From $1,796
Compare at $7,510
IGISave 87.3%5.95ct | Cushion | E | VS1 | Ideal
From $1,884
Compare at $14,870
IGISave 83.7%5.95ct | Cushion | F | VS1 | Ideal
From $2,204
Compare at $13,560
Entry pricing in this category starts around $1,297.
What to Know When Shopping for 5.9 Carat Cushion Lab Grown Diamonds
- Always compare identical certified diamonds across retailers. Identical certificate numbers can have price differences of $16,103 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 $2,101 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 35 comparable stones in this segment. Prices start around $1,297 and go up to $17,400.
Based on the latest market data, the average asking price is about $3,000 with a median around $2,101.
The observed spread is roughly $16,103 across tracked listings, which is about 92.5% 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 $2,101, 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 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 $16,103 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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