3.5 Carat Radiant Lab Grown Diamond Prices Comparison
As of October 2026, 3.5 carat radiant lab grown diamonds in the 3.50–3.99 carat benchmark range usually range from $377 to $21,460, with an average price of $2,866.In the last month, prices for these diamonds are down 1.4%.Compare 2,467 verified listings across 15 retailers tracked by CaratRadar.
3.5 Carat Radiant Lab Grown Diamond Market Overview
CaratRadar currently tracks 2,467 verified 3.5-carat radiant lab grown diamonds in the 3.50–3.99 carat benchmark range, listed across 15 online retailers. Prices in this segment range from $377 to $21,460, with an average asking price of $2,866 and a median of $2,035.
The price spread of $21,083 (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 use the same benchmark range throughout the page and 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.
2,467 diamonds tracked in the 3.50–3.99 carat benchmark
Price range: $377 to $21,460
Average price: $2,866
Median price: $2,035
Available across 15 retailers
Savings potential: up to 98.2%
Price Range Overview
As of Oct 12, 2026Real market range for this carat, shape, and diamond type.
2,467
$377
$2,866
$2,035
$21,460
Price History
Price Comparison Matrix
Live Listings
See all listingsCompare current retailer offers in the same benchmark range and open any listing for full details.
Save 64.5%IGI | 3.57ct | Radiant | I | VS1 | Excellent
From $585
Compare at $1,646
Save 64.2%IGI | 3.58ct | Radiant | I | VS1 | Excellent
From $590
Compare at $1,650
Save 77.1%IGI | 3.52ct | Radiant | FANCY | VS1 | Very Good
From $601
Compare at $2,623
Save 77.8%IGI | 3.51ct | Radiant | H | VS1 | Ideal
From $603
Compare at $2,720
Save 77.1%IGI | 3.53ct | Radiant | FANCY | VS2 | Very Good
From $603
Compare at $2,630
Save 71.4%IGI | 3.56ct | Radiant | G | VS2 | Ideal
From $635
Compare at $2,217
Save 71.1%IGI | 3.69ct | Radiant | H | VVS2 | Ideal
From $635
Compare at $2,198
Save 71.4%IGI | 3.67ct | Radiant | G | VS2 | Ideal
From $635
Compare at $2,219
Save 71.8%IGI | 3.57ct | Radiant | G | VS2 | Ideal
From $635
Compare at $2,255
Save 49.7%IGI | 3.59ct | Radiant | FANCY | VS1 | Very Good
From $639
Compare at $1,271
Save 78%IGI | 3.53ct | Radiant | G | VS2 | Ideal
From $640
Compare at $2,910
Save 77.9%IGI | 3.51ct | Radiant | G | VS2 | Very Good
From $640
Compare at $2,890
Save 72.4%IGI | 3.87ct | Radiant | G | VS2 | Ideal
From $645
Compare at $2,340
Save 72%IGI | 3.5ct | Radiant | G | VS1 | Ideal
From $655
Compare at $2,337
Save 72.2%IGI | 3.62ct | Radiant | G | VS1 | Ideal
From $655
Compare at $2,352
Save 72.2%IGI | 3.62ct | Radiant | G | VS1 | Ideal
From $655
Compare at $2,352
Save 72.1%IGI | 3.61ct | Radiant | G | VS1 | Ideal
From $655
Compare at $2,346
Save 72.1%IGI | 3.5ct | Radiant | G | VS1 | Ideal
From $660
Compare at $2,369
Save 72.2%IGI | 3.66ct | Radiant | G | VS1 | Ideal
From $660
Compare at $2,378
Save 54.9%IGI | 3.92ct | Radiant | E | VS1 | Ideal
From $665
Compare at $1,473
Save 72.2%IGI | 3.68ct | Radiant | G | VS1 | Ideal
From $665
Compare at $2,391
Save 72.3%IGI | 3.59ct | Radiant | G | VS1 | Ideal
From $665
Compare at $2,398
Save 67.2%IGI | 3.5ct | Radiant | G | VS1 | Ideal
From $666
Compare at $2,032
Save 72%IGI | 3.58ct | Radiant | G | VS1 | Excellent
From $670
Compare at $2,391
Save 72.1%IGI | 3.65ct | Radiant | G | VVS2 | Ideal
From $670
Compare at $2,405
Save 72.5%IGI | 3.65ct | Radiant | G | VVS2 | Ideal
From $670
Compare at $2,438
Save 71.1%IGI | 3.73ct | Radiant | F | VVS2 | Ideal
From $674
Compare at $2,330
Save 66%IGI | 3.53ct | Radiant | G | VS1 | Very Good
From $675
Compare at $1,985
Save 65.8%IGI | 3.52ct | Radiant | D | SI2 | Ideal
From $678
Compare at $1,980
Save 77.8%IGI | 3.7ct | Radiant | G | VS2 | Ideal
From $680
Compare at $3,060
Save 66%IGI | 3.51ct | Radiant | G | VS2 | Excellent
From $680
Compare at $1,999
Save 78.8%IGI | 3.52ct | Radiant | F | VS2 | Ideal
From $680
Compare at $3,200
Save 72.1%IGI | 3.51ct | Radiant | G | VVS2 | Ideal
From $680
Compare at $2,439
Save 49.1%IGI | 3.58ct | Radiant | G | VVS2 | Ideal
From $681
Compare at $1,337
Save 63.2%IGI | 3.53ct | Radiant | F | VS1 | Very Good
From $684
Compare at $1,858
Save 72.2%IGI | 3.55ct | Radiant | G | VVS2 | Ideal
From $685
Compare at $2,467
Save 79.7%IGI | 3.52ct | Radiant | F | VS2 | Excellent
From $687
Compare at $3,380
Save 41.1%IGI | 3.5ct | Radiant | F | VVS2 | Very Good
From $692
Compare at $1,175
Save 67.8%IGI | 3.7ct | Radiant | E | VS1 | Excellent
From $697
Compare at $2,163
Save 39.5%IGI | 3.81ct | Radiant | FANCY | VS1 | Very Good
From $698
Compare at $1,154
Save 39.5%IGI | 3.68ct | Radiant | D | VS1 | Ideal
From $698
Compare at $1,154
Save 69.8%IGI | 3.51ct | Radiant | F | VS1 | Very Good
From $699
Compare at $2,313
Save 66.3%IGI | 3.56ct | Radiant | G | VS1 | Very Good
From $700
Compare at $2,075
Save 69.8%IGI | 3.52ct | Radiant | E | VVS2 | Ideal
From $704
Compare at $2,330
Save 69.8%IGI | 3.52ct | Radiant | E | VVS2 | Ideal
From $704
Compare at $2,330
Save 79.7%IGI | 3.8ct | Radiant | G | VS1 | Ideal
From $705
Compare at $3,480
Save 79.7%IGI | 3.8ct | Radiant | G | VS1 | Ideal
From $705
Compare at $3,480
Save 79.9%IGI | 3.82ct | Radiant | G | VS1 | Ideal
From $705
Compare at $3,500
Save 48.3%IGI | 3.5ct | Radiant | F | VS1 | Excellent
From $707
Compare at $1,367
Save 63.2%IGI | 3.52ct | Radiant | E | VS1 | Excellent
From $707
Compare at $1,922
Entry pricing in this benchmark range starts around $377.
What to Know When Shopping for 3.5 Carat Radiant Lab Grown Diamonds
- Always compare identical certified diamonds across retailers. Identical certificate numbers can have price differences of $21,083 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 $2,035 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.
- Radiant cuts combine the elegance of emerald shapes with the brilliance of round cuts, offering good value per carat.
Frequently Asked Questions
We currently track 2,467 comparable stones in the 3.50–3.99 carat benchmark range. Prices start around $377 and go up to $21,460.
Based on the latest market data, the average asking price is about $2,866 with a median around $2,035.
The observed spread is roughly $21,083 across tracked listings, which is about 98.2% from highest to lowest offer in the 3.50–3.99 carat benchmark range.
We refresh pricing data daily so these pages stay current with market changes.
Based on completed market data, the fair market benchmark is $2,866. The median price is $2,035, 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 15 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 $21,083 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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Tracking Lab Grown inventory for the 3.50–3.99 carat Radiant diamond benchmark.