4.9 Carat Cushion Lab Grown Diamond Prices Comparison
As of May 2026, 4.9 carat cushion lab grown diamonds usually range from $650 to $39,620, with an average price of $4,134.In the last month, prices for these diamonds are down 0.8%.Compare 32 verified listings across 7 retailers tracked by CaratRadar.
4.9 Carat Cushion Lab Grown Diamond Market Overview
CaratRadar currently tracks 32 verified 4.9-carat cushion lab grown diamonds listed across 7 online retailers. Prices in this segment range from $650 to $39,620, with an average asking price of $4,134 and a median of $2,843.
The price spread of $38,970 (98.4% 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.
32 diamonds tracked in this segment
Price range: $650 to $39,620
Average price: $4,134
Median price: $2,843
Available across 7 retailers
Savings potential: up to 98.4%
Price Range Overview
As of May 30, 2026Real market range for this carat, shape, and diamond type.
32
$650
$4,134
$2,843
$39,620
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 76%IGI | 4.98ct | Cushion | E | VS1 | Ideal
From $966
Compare at $4,030
Save 68.1%IGI | 4.94ct | Cushion | E | VS1 | Very Good
From $977
Compare at $3,060
Save 67.3%IGI | 4.92ct | Cushion | E | VS1 | Very Good
From $994
Compare at $3,042
Save 65.7%IGI | 4.91ct | Cushion | E | VS1 | Very Good
From $1,040
Compare at $3,030
Save 66.6%IGI | 4.99ct | Cushion | E | VVS2 | Very Good
From $1,050
Compare at $3,145
Save 66.5%IGI | 4.99ct | Cushion | E | VVS2 | Very Good
From $1,051
Compare at $3,140
Save 65.1%IGI | 4.92ct | Cushion | E | VVS2 | Excellent
From $1,068
Compare at $3,064
IGI | 4.96ct | Cushion | G | VS1 | Very Good
From $1,091
Compare at $4,940
Save 64%IGI | 4.99ct | Cushion | E | VS2 | Very Good
From $1,194
Compare at $3,319
Save 60%IGI | 4.91ct | Cushion | E | VS1 | Very Good
From $1,238
Compare at $3,095
Save 54.4%IGI | 4.91ct | Cushion | F | VVS2 | Very Good
From $1,279
Compare at $2,807
Save 72.9%IGI | 4.98ct | Cushion | FANCY | VS1 | Very Good
From $1,421
Compare at $5,235
Save 72.9%IGI | 4.99ct | Cushion | FANCY | VS2 | Very Good
From $1,434
Compare at $5,286
Save 72.9%IGI | 4.93ct | Cushion | FANCY | VVS2 | Good
From $1,460
Compare at $5,382
Save 54.6%IGI | 4.98ct | Cushion | E | VVS2 | Ideal
From $1,483
Compare at $3,267
Save 61.7%IGI | 4.92ct | Cushion | D | VVS2 | Very Good
From $1,571
Compare at $4,107
Save 64.4%IGI | 4.93ct | Cushion | FANCY | VVS2 | Very Good
From $2,045
Compare at $5,741
Save 76.3%IGI | 4.99ct | Cushion | F | VVS2 | Very Good
From $2,271
Compare at $9,580
Save 71.7%IGI | 4.92ct | Cushion | FANCY | VVS2 | Very Good
From $2,811
Compare at $9,946
Save 16.6%IGI | 4.91ct | Cushion | F | VVS2 | Very Good
From $2,835
Compare at $3,400
Save 45.9%GIA | 4.96ct | Cushion | D | VVS2 | Excellent
From $2,882
Compare at $5,332
Save 66%GIA | 4.92ct | Cushion | E | VVS2 | Excellent
From $3,176
Compare at $9,340
Save 43.8%GIA | 4.91ct | Cushion | F | VS2 | Excellent
From $3,656
Compare at $6,500
Save 74.9%IGI | 4.92ct | Cushion | D | VVS1 | Good
From $4,372
Compare at $17,408
Save 71.6%GIA | 4.92ct | Cushion | E | VVS2 | Ideal
From $7,921
Compare at $27,930
Save 78.1%GIA | 4.95ct | Cushion | E | IF | Very Good
From $10,314
Compare at $47,176
Save 68.4%IGI | 4.96ct | Cushion | D | FL | Ideal
From $11,019
Compare at $34,920
Save 49.7%IGI | 4.96ct | Cushion | D | FL | Very Good
From $11,306
Compare at $22,496
Save 57.3%IGI | 4.92ct | Cushion | D | FL | Ideal
From $14,393
Compare at $33,720
Save 33%GIA | 4.98ct | Cushion | D | FL | Ideal
From $30,369
Compare at $45,344
Save 29.1%GIA | 4.99ct | Cushion | D | FL | Ideal
From $32,210
Compare at $45,435
Save 29.1%GIA | 4.99ct | Cushion | D | FL | Very Good
From $32,210
Compare at $45,435
Entry pricing in this category starts around $650.
What to Know When Shopping for 4.9 Carat Cushion Lab Grown Diamonds
- Always compare identical certified diamonds across retailers. Identical certificate numbers can have price differences of $38,970 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 $2,843 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 32 comparable stones in this segment. Prices start around $650 and go up to $39,620.
Based on the latest market data, the average asking price is about $4,134 with a median around $2,843.
The observed spread is roughly $38,970 across tracked listings, which is about 98.4% 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 $4,134. The median price is $2,843, 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 $38,970 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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