15 Carat Radiant Lab Grown Diamond Prices Comparison
As of October 2026, 15 carat radiant lab grown diamonds in the 15.00–15.99 carat benchmark range usually range from $2,131 to $130,211, with an average price of $12,519.In the last month, prices for these diamonds are down 3.2%.Compare 158 verified listings across 9 retailers tracked by CaratRadar.
15 Carat Radiant Lab Grown Diamond Market Overview
CaratRadar currently tracks 158 verified 15-carat radiant lab grown diamonds in the 15.00–15.99 carat benchmark range, listed across 9 online retailers. Prices in this segment range from $2,131 to $130,211, with an average asking price of $12,519 and a median of $9,545.
The price spread of $128,080 (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 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.
158 diamonds tracked in the 15.00–15.99 carat benchmark
Price range: $2,131 to $130,211
Average price: $12,519
Median price: $9,545
Available across 9 retailers
Savings potential: up to 98.4%
Price Range Overview
As of Oct 15, 2026Real market range for this carat, shape, and diamond type.
158
$2,131
$12,519
$9,545
$130,211
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 78.8%IGI | 15.22ct | Radiant | G | VS1 | Ideal
From $2,804
Compare at $13,204
Save 78.4%IGI | 15ct | Radiant | F | VS1 | Very Good
From $3,035
Compare at $14,055
Save 79.9%IGI | 15ct | Radiant | F | VVS2 | Ideal
From $3,045
Compare at $15,116
Save 79.9%IGI | 15.03ct | Radiant | F | VVS2 | Ideal
From $3,050
Compare at $15,175
Save 79.9%IGI | 15.06ct | Radiant | F | VVS2 | Ideal
From $3,055
Compare at $15,234
Save 79.1%IGI | 15.04ct | Radiant | G | VS2 | Ideal
From $3,065
Compare at $14,670
Save 79.1%IGI | 15.04ct | Radiant | G | VS2 | Ideal
From $3,065
Compare at $14,670
Save 80%IGI | 15.1ct | Radiant | F | VVS2 | Ideal
From $3,065
Compare at $15,313
Save 80%IGI | 15.09ct | Radiant | F | VVS2 | Ideal
From $3,065
Compare at $15,293
Save 39.3%IGI | 15.07ct | Radiant | FANCY | SI2 | Very Good
From $3,093
Compare at $5,096
Save 75.7%IGI | 15.01ct | Radiant | G | VS1 | Ideal
From $3,140
Compare at $12,915
Save 72.5%IGI | 15ct | Radiant | H | VS2 | Ideal
From $3,185
Compare at $11,593
Save 72.6%IGI | 15.03ct | Radiant | H | VS2 | Ideal
From $3,190
Compare at $11,637
Save 72.6%IGI | 15.03ct | Radiant | H | VS2 | Ideal
From $3,190
Compare at $11,637
Save 72.7%IGI | 15.08ct | Radiant | H | VS2 | Ideal
From $3,200
Compare at $11,711
Save 72.9%IGI | 15.22ct | Radiant | H | VS2 | Ideal
From $3,230
Compare at $11,922
Save 74.8%IGI | 15.05ct | Radiant | G | VS1 | Very Good
From $3,230
Compare at $12,839
Save 73%IGI | 15.06ct | Radiant | I | VS1 | Very Good
From $3,233
Compare at $11,993
Save 70.8%IGI | 15.56ct | Radiant | H | VS1 | Ideal
From $3,301
Compare at $11,295
Save 79.7%IGI | 15.02ct | Radiant | F | VVS2 | Excellent
From $3,326
Compare at $16,350
Save 77.9%IGI | 15.09ct | Radiant | G | VVS2 | Very Good
From $3,331
Compare at $15,081
Save 77.4%IGI | 15.02ct | Radiant | G | VVS2 | Very Good
From $3,376
Compare at $14,960
Save 78.3%IGI | 15.39ct | Radiant | G | VVS2 | Very Good
From $3,397
Compare at $15,671
Save 29.3%IGI | 15.08ct | Radiant | G | VVS2 | Ideal
From $3,451
Compare at $4,879
Save 76.7%IGI | 15.08ct | Radiant | G | VVS2 | Excellent
From $3,512
Compare at $15,105
Save 76.8%IGI | 15.11ct | Radiant | G | VVS2 | Ideal
From $3,519
Compare at $15,165
Save 76.3%IGI | 15.03ct | Radiant | G | VVS2 | Very Good
From $3,561
Compare at $15,025
Save 69.4%IGI | 15.04ct | Radiant | H | VS2 | Ideal
From $3,563
Compare at $11,652
Save 76.6%IGI | 15.05ct | Radiant | F | VVS2 | Ideal
From $3,611
Compare at $15,420
Save 69.7%IGI | 15.07ct | Radiant | H | VVS2 | Excellent
From $3,712
Compare at $12,260
Save 73.4%IGI | 15.03ct | Radiant | G | VS1 | Ideal
From $3,744
Compare at $14,064
Save 73.4%IGI | 15.08ct | Radiant | G | VS1 | Very Good
From $3,756
Compare at $14,111
Save 33.6%IGI | 15.12ct | Radiant | F | VVS2 | Ideal
From $3,766
Compare at $5,674
Save 74.1%IGI | 15ct | Radiant | G | VVS2 | Excellent
From $3,768
Compare at $14,540
Save 74.1%IGI | 15.01ct | Radiant | G | VVS2 | Very Good
From $3,771
Compare at $14,550
Save 73.4%IGI | 15.06ct | Radiant | H | VS1 | Ideal
From $3,782
Compare at $14,222
Save 74.1%IGI | 15.06ct | Radiant | G | VVS2 | Excellent
From $3,783
Compare at $14,600
Save 74.1%IGI | 15.06ct | Radiant | G | VVS2 | Very Good
From $3,783
Compare at $14,600
Save 74.1%IGI | 15.07ct | Radiant | G | VVS2 | Excellent
From $3,786
Compare at $14,610
Save 74.1%IGI | 15.07ct | Radiant | G | VVS2 | Excellent
From $3,786
Compare at $14,610
Save 74.8%IGI | 15.03ct | Radiant | F | VS1 | Excellent
From $3,804
Compare at $15,100
Save 74.8%IGI | 15.07ct | Radiant | F | VS1 | Ideal
From $3,815
Compare at $15,140
Save 74.6%IGI | 15.03ct | Radiant | F | VS1 | Ideal
From $3,835
Compare at $15,100
Save 74.6%IGI | 15.03ct | Radiant | F | VS1 | Ideal
From $3,835
Compare at $15,100
Save 75.3%IGI | 15.08ct | Radiant | F | VVS2 | Excellent
From $3,841
Compare at $15,549
Save 74.6%IGI | 15.07ct | Radiant | F | VS1 | Very Good
From $3,845
Compare at $15,140
Save 76.6%IGI | 15.07ct | Radiant | F | VVS2 | Ideal
From $3,845
Compare at $16,400
Save 79.7%IGI | 15.01ct | Radiant | FANCY | VS2 | Very Good
From $3,849
Compare at $18,987
Save 74.6%IGI | 15.09ct | Radiant | F | VS1 | Ideal
From $3,850
Compare at $15,160
Save 64.9%IGI | 15.04ct | Radiant | H | VS1 | Excellent
From $3,859
Compare at $10,980
Entry pricing in this benchmark range starts around $2,131.
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 $128,080 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 $9,545 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 158 comparable stones in the 15.00–15.99 carat benchmark range. Prices start around $2,131 and go up to $130,211.
Based on the latest market data, the average asking price is about $12,519 with a median around $9,545.
The observed spread is roughly $128,080 across tracked listings, which is about 98.4% from highest to lowest offer in the 15.00–15.99 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 $12,519. The median price is $9,545, 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 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 $128,080 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 15.00–15.99 carat Radiant diamond benchmark.