4.2 Carat Cushion Lab Grown Diamond Prices Comparison
As of April 2026, 4.2 carat cushion lab grown diamonds usually range from $820 to $46,590, with an average price of $5,982.In the last month, prices for these diamonds are up 2%.Compare 236 verified listings across 9 retailers tracked by CaratRadar.
4.2 Carat Cushion Lab Grown Diamond Market Overview
CaratRadar currently tracks 236 verified 4.2-carat cushion lab grown diamonds listed across 9 online retailers. Prices in this segment range from $820 to $46,590, with an average asking price of $5,982 and a median of $4,895.
The price spread of $45,770 (98.2% 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.
236 diamonds tracked in this segment
Price range: $820 to $46,590
Average price: $5,982
Median price: $4,895
Available across 9 retailers
Savings potential: up to 98.2%
Price Range Overview
As of Apr 14, 2026Real market range for this carat, shape, and diamond type.
236
$820
$5,982
$4,895
$46,590
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 74.9%GIA | 4.21ct | Cushion | D | VVS1 | Excellent
From $6,035
Compare at $24,010
Save 58.4%GIA | 4.21ct | Cushion | E | VVS2 | Excellent
From $4,883
Compare at $11,728
Save 69.3%GIA | 4.21ct | Cushion | E | VVS1 | Excellent
From $2,808
Compare at $9,160
Save 68.6%IGI | 4.21ct | Cushion | G | VS1 | Ideal
From $1,303
Compare at $4,150
Save 80.4%IGI | 4.21ct | Cushion | G | VS2 | Ideal
From $1,296
Compare at $6,620
Save 80.7%IGI | 4.21ct | Cushion | D | FL | Very Good
From $11,985
Compare at $62,100
Save 73.2%IGI | 4.21ct | Cushion | D | VVS1 | Ideal
From $5,452
Compare at $20,310
Save 81.8%IGI | 4.21ct | Cushion | D | VVS2 | Ideal
From $2,136
Compare at $11,710
Save 50.9%IGI | 4.21ct | Cushion | F | VVS2 | Ideal
From $5,725
Compare at $11,660
Save 74.3%IGI | 4.21ct | Cushion | D | VVS1 | Ideal
From $3,525
Compare at $13,720
Save 15.9%IGI | 4.21ct | Cushion | E | VVS2 | Ideal
From $7,073
Compare at $8,410
Save 85.1%IGI | 4.21ct | Cushion | E | VVS2 | Very Good
From $1,514
Compare at $10,130
Save 72.4%IGI | 4.21ct | Cushion | E | VVS1 | Ideal
From $3,246
Compare at $11,760
Save 59.2%IGI | 4.21ct | Cushion | D | VVS1 | Ideal
From $3,156
Compare at $7,745
Save 71.3%IGI | 4.21ct | Cushion | G | VVS2 | Very Good
From $2,845
Compare at $9,930
Save 73.1%IGI | 4.21ct | Cushion | E | VVS1 | Ideal
From $3,165
Compare at $11,770
Save 65.9%IGI | 4.21ct | Cushion | F | VS1 | Very Good
From $1,133
Compare at $3,325
Save 76%IGI | 4.21ct | Cushion | D | IF | Ideal
From $9,695
Compare at $40,380
Save 60.3%IGI | 4.21ct | Cushion | D | VVS2 | Good
From $4,685
Compare at $11,800
Save 82.5%IGI | 4.21ct | Cushion | D | VVS1 | Very Good
From $2,387
Compare at $13,670
Save 41.9%IGI | 4.21ct | Cushion | G | VVS2 | Very Good
From $2,307
Compare at $3,968
Save 46.2%IGI | 4.21ct | Cushion | D | VVS2 | Very Good
From $2,215
Compare at $4,120
Save 77.3%IGI | 4.21ct | Cushion | D | IF | Very Good
From $9,880
Compare at $43,620
Save 38.5%IGI | 4.21ct | Cushion | E | VVS1 | Very Good
From $3,295
Compare at $5,362
IGI | 4.21ct | Cushion | D | FL | Excellent
From $28,150
Compare at $30,138
Save 28%IGI | 4.21ct | Cushion | D | VVS1 | Very Good
From $3,165
Compare at $4,393
Save 28.1%IGI | 4.21ct | Cushion | D | VVS1 | Very Good
From $1,855
Compare at $2,582
Save 81.5%IGI | 4.21ct | Cushion | F | VS1 | Ideal
From $895
Compare at $4,830
Save 47.6%GIA | 4.22ct | Cushion | D | VVS1 | Very Good
From $21,810
Compare at $41,629
Save 75.8%GIA | 4.22ct | Cushion | D | VVS1 | Excellent
From $5,589
Compare at $23,050
Save 74.9%GIA | 4.22ct | Cushion | D | VVS1 | Excellent
From $6,050
Compare at $24,060
Save 63.6%GIA | 4.22ct | Cushion | E | VVS1 | Excellent
From $5,540
Compare at $15,203
Save 63.1%GIA | 4.22ct | Cushion | F | VVS2 | Excellent
From $3,378
Compare at $9,150
Save 73.8%IGI | 4.22ct | Cushion | E | VS1 | Excellent
From $1,624
Compare at $6,200
Save 57.5%IGI | 4.22ct | Cushion | H | VS1 | Excellent
From $1,470
Compare at $3,460
Save 76.3%IGI | 4.22ct | Cushion | F | VS1 | Very Good
From $1,911
Compare at $8,060
Save 64.9%IGI | 4.22ct | Cushion | E | VS1 | Excellent
From $2,281
Compare at $6,499
Save 80.2%IGI | 4.22ct | Cushion | F | VVS1 | Ideal
From $2,051
Compare at $10,370
Save 63.8%IGI | 4.22ct | Cushion | D | VVS2 | Ideal
From $1,923
Compare at $5,315
Save 67.3%IGI | 4.22ct | Cushion | E | FL | Excellent
From $22,750
Compare at $69,520
Save 73.3%IGI | 4.22ct | Cushion | D | FL | Ideal
From $16,623
Compare at $62,250
Save 76.5%IGI | 4.22ct | Cushion | G | VS1 | Ideal
From $1,580
Compare at $6,730
Save 71.5%IGI | 4.22ct | Cushion | D | VVS2 | Very Good
From $2,563
Compare at $8,980
Save 73.5%IGI | 4.22ct | Cushion | D | VVS1 | Good
From $6,074
Compare at $22,930
Save 76%IGI | 4.22ct | Cushion | D | IF | Very Good
From $9,720
Compare at $40,470
Save 71.4%IGI | 4.22ct | Cushion | D | VVS2 | Excellent
From $2,836
Compare at $9,900
Save 65.3%IGI | 4.22ct | Cushion | D | VVS2 | Ideal
From $4,070
Compare at $11,740
Save 41.7%IGI | 4.22ct | Cushion | E | VVS2 | Very Good
From $1,809
Compare at $3,104
Save 65.9%IGI | 4.22ct | Cushion | D | VVS2 | Very Good
From $2,836
Compare at $8,320
IGI | 4.22ct | Cushion | F | VS1 | Very Good
From $1,396
Compare at $1,400
Entry pricing in this category starts around $820.
What to Know When Shopping for 4.2 Carat Cushion Lab Grown Diamonds
- Always compare identical certified diamonds across retailers. Identical certificate numbers can have price differences of $45,770 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 $4,895 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 236 comparable stones in this segment. Prices start around $820 and go up to $46,590.
Based on the latest market data, the average asking price is about $5,982 with a median around $4,895.
The observed spread is roughly $45,770 across tracked listings, which is about 98.2% 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 $4,895, 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 9 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 $45,770 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.
Related Price Categories
Explore adjacent carat ranges and shapes to compare market shifts.
4.1 Carat Cushion Lab Grown Diamond Prices
4.3 Carat Cushion Lab Grown Diamond Prices
4 Carat Cushion Lab Grown Diamond Prices
4.4 Carat Cushion Lab Grown Diamond Prices
3.9 Carat Cushion Lab Grown Diamond Prices
4.5 Carat Cushion Lab Grown Diamond Prices
3.8 Carat Cushion Lab Grown Diamond Prices
4.2 Carat Round Lab Grown Diamond Prices
4.2 Carat Oval Lab Grown Diamond Prices
4.2 Carat Radiant Lab Grown Diamond Prices
4.2 Carat Emerald Lab Grown Diamond Prices
4.2 Carat Pear Lab Grown Diamond Prices
Tracking Lab Grown inventory for 4.2 carat Cushion diamonds.