15 Carat Radiant Lab Grown Diamond Prices Comparison
As of April 2026, 15 carat radiant lab grown diamonds usually range from $3,430 to $74,810, with an average price of $18,254.In the last month, prices for these diamonds are down 4%.Compare 90 verified listings across 3 retailers tracked by CaratRadar.
15 Carat Radiant Lab Grown Diamond Market Overview
CaratRadar currently tracks 90 verified 15-carat radiant lab grown diamonds listed across 3 online retailers. Prices in this segment range from $3,430 to $74,810, with an average asking price of $18,254 and a median of $13,372.
The price spread of $71,380 (95.4% 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.
90 diamonds tracked in this segment
Price range: $3,430 to $74,810
Average price: $18,254
Median price: $13,372
Available across 3 retailers
Savings potential: up to 95.4%
Price Range Overview
As of Apr 15, 2026Real market range for this carat, shape, and diamond type.
90
$3,430
$18,254
$13,372
$74,810
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 53.1%IGI | 15ct | Radiant | G | VS2 | Ideal
From $12,462
Compare at $26,590
Save 87.9%IGI | 15ct | Radiant | G | VVS2 | Excellent
From $4,443
Compare at $36,666
Save 86.4%IGI | 15ct | Radiant | F | VS1 | Good
From $5,192
Compare at $38,194
Save 74.8%IGI | 15ct | Radiant | G | VVS2 | Ideal
From $5,349
Compare at $21,200
Save 67.1%IGI | 15ct | Radiant | E | VS1 | Very Good
From $13,565
Compare at $41,250
Save 54.5%IGI | 15.01ct | Radiant | G | VS1 | Ideal
From $13,475
Compare at $29,590
Save 87.9%IGI | 15.01ct | Radiant | G | VVS2 | Very Good
From $4,446
Compare at $36,690
Save 84.8%IGI | 15.01ct | Radiant | F | VVS2 | Excellent
From $5,084
Compare at $33,510
Save 83.6%IGI | 15.01ct | Radiant | F | VS1 | Excellent
From $5,085
Compare at $30,920
Save 80.3%IGI | 15.01ct | Radiant | E | VVS2 | Ideal
From $7,355
Compare at $37,260
Save 57.6%IGI | 15.02ct | Radiant | I | SI1 | Ideal
From $3,951
Compare at $9,310
Save 25.3%IGI | 15.02ct | Radiant | H | VS2 | Ideal
From $10,361
Compare at $13,877
Save 72.9%IGI | 15.02ct | Radiant | F | VS2 | Ideal
From $7,186
Compare at $26,540
Save 83.1%IGI | 15.02ct | Radiant | F | VVS2 | Excellent
From $5,681
Compare at $33,530
Save 87.1%IGI | 15.02ct | Radiant | F | VVS2 | Very Good
From $4,960
Compare at $38,536
Save 86.9%IGI | 15.02ct | Radiant | F | VVS2 | Ideal
From $5,056
Compare at $38,536
Save 86.5%IGI | 15.02ct | Radiant | F | VVS2 | Excellent
From $5,199
Compare at $38,536
Save 86.4%IGI | 15.02ct | Radiant | F | VS1 | Excellent
From $5,199
Compare at $38,245
Save 82.2%IGI | 15.03ct | Radiant | E | VS2 | Excellent
From $5,307
Compare at $29,760
Save 16.8%IGI | 15.03ct | Radiant | E | VS1 | Excellent
From $12,290
Compare at $14,780
Save 85.5%IGI | 15.03ct | Radiant | G | VVS2 | Ideal
From $4,320
Compare at $29,730
Save 50%IGI | 15.03ct | Radiant | E | VVS2 | Excellent
From $7,863
Compare at $15,733
Save 85.2%IGI | 15.03ct | Radiant | F | VVS2 | Ideal
From $4,963
Compare at $33,550
Save 86.4%IGI | 15.03ct | Radiant | F | VS1 | Excellent
From $5,202
Compare at $38,268
Save 86.4%IGI | 15.03ct | Radiant | F | VS1 | Excellent
From $5,202
Compare at $38,268
Save 65.1%IGI | 15.03ct | Radiant | E | VVS2 | Very Good
From $14,097
Compare at $40,381
Save 86.5%IGI | 15.03ct | Radiant | F | VVS2 | Excellent
From $5,202
Compare at $38,559
Save 87.2%IGI | 15.03ct | Radiant | F | VVS2 | Ideal
From $5,080
Compare at $39,754
Save 26.7%IGI | 15.03ct | Radiant | F | VVS2 | Very Good
From $9,837
Compare at $13,429
Save 81.9%IGI | 15.03ct | Radiant | G | VVS2 | Excellent
From $5,359
Compare at $29,680
Save 83.5%IGI | 15.03ct | Radiant | F | VS1 | Excellent
From $5,105
Compare at $30,960
Save 81.7%IGI | 15.03ct | Radiant | F | VS1 | Ideal
From $5,652
Compare at $30,960
Save 25.3%IGI | 15.04ct | Radiant | H | VS2 | Ideal
From $10,374
Compare at $13,895
Save 48.9%IGI | 15.04ct | Radiant | G | VS2 | Ideal
From $13,615
Compare at $26,660
Save 48.9%IGI | 15.04ct | Radiant | G | VS2 | Ideal
From $13,615
Compare at $26,660
IGI | 15.04ct | Radiant | E | VS1 | Ideal
From $7,534
Compare at $41,360
Save 86.8%IGI | 15.04ct | Radiant | F | VS1 | Ideal
From $5,063
Compare at $38,293
Save 86.5%IGI | 15.04ct | Radiant | F | VVS2 | Good
From $5,206
Compare at $38,585
Save 38.6%IGI | 15.04ct | Radiant | F | VVS2 | Excellent
From $8,773
Compare at $14,288
Save 48.9%IGI | 15.05ct | Radiant | G | VS2 | Ideal
From $13,624
Compare at $26,680
IGI | 15.05ct | Radiant | E | VS1 | Ideal
From $7,539
Compare at $41,388
Save 77.7%IGI | 15.05ct | Radiant | D | VVS2 | Very Good
From $19,554
Compare at $87,566
Save 85.5%IGI | 15.05ct | Radiant | G | VVS2 | Ideal
From $4,325
Compare at $29,770
Save 58.3%IGI | 15.05ct | Radiant | F | VVS2 | Ideal
From $5,210
Compare at $12,480
Save 87.1%IGI | 15.05ct | Radiant | F | VVS2 | Ideal
From $4,970
Compare at $38,613
Save 86.9%IGI | 15.05ct | Radiant | F | VVS2 | Ideal
From $5,066
Compare at $38,613
Save 86.5%IGI | 15.05ct | Radiant | F | VVS2 | Very Good
From $5,210
Compare at $38,613
Save 84.8%IGI | 15.05ct | Radiant | F | VVS2 | Excellent
From $5,098
Compare at $33,590
Save 26.7%IGI | 15.05ct | Radiant | F | VVS2 | Very Good
From $9,850
Compare at $13,447
Save 81.9%IGI | 15.05ct | Radiant | G | VVS2 | Excellent
From $5,366
Compare at $29,720
Entry pricing in this category starts around $3,430.
What to Know When Shopping for 15 Carat Radiant Lab Grown Diamonds
- Always compare identical certified diamonds across retailers. Identical certificate numbers can have price differences of $71,380 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 $13,372 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 90 comparable stones in this segment. Prices start around $3,430 and go up to $74,810.
Based on the latest market data, the average asking price is about $18,254 with a median around $13,372.
The observed spread is roughly $71,380 across tracked listings, which is about 95.4% 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 $13,372, 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 3 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 $71,380 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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