15 Carat Radiant Lab Grown Diamond Prices Comparison
As of March 2026, 15 carat radiant lab grown diamonds usually range from $3,919 to $20,088, with an average price of $9,308.In the last month, prices for these diamonds are down 6.6%.Compare 50 verified listings across 4 retailers tracked by CaratRadar.
15 Carat Radiant Lab Grown Diamond Market Overview
CaratRadar currently tracks 50 verified 15-carat radiant lab grown diamonds listed across 4 online retailers. Prices in this segment range from $3,919 to $20,088, with an average asking price of $9,308 and a median of $10,010.
The price spread of $16,169 (80.5% 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.
50 diamonds tracked in this segment
Price range: $3,919 to $20,088
Average price: $9,308
Median price: $10,010
Available across 4 retailers
Savings potential: up to 80.5%
Price Range Overview
As of Mar 1, 2026Real market range for this carat, shape, and diamond type.
50
$3,919
$9,308
$10,010
$20,088
Price History
Price Comparison Matrix
Live Listings
See all listingsCompare current retailer offers for this exact segment and open any listing for full details.
IGISave 81.2%14.99ct | Radiant | I | VS2 | Ideal
From $4,036
Compare at $21,448
IGISave 67.1%15ct | Radiant | G | VS2 | Ideal
From $12,462
Compare at $37,870
IGISave 67.1%15ct | Radiant | E | VS1 | Very Good
From $13,565
Compare at $41,250
IGISave 26.5%15ct | Radiant | H | VS2 | Ideal
From $10,184
Compare at $13,858
IGISave 78.7%15ct | Radiant | G | VVS2 | Excellent
From $7,822
Compare at $36,666
IGISave 74.3%15ct | Radiant | F | VS1 | Good
From $9,817
Compare at $38,194
IGISave 87.1%15.01ct | Radiant | F | VVS2 | Excellent
From $4,308
Compare at $33,510
IGISave 69.3%15.01ct | Radiant | G | VS1 | Ideal
From $13,475
Compare at $43,900
IGISave 88.3%15.01ct | Radiant | G | VVS2 | Very Good
From $4,280
Compare at $36,690
IGISave 61.9%15.01ct | Radiant | E | VVS2 | Ideal
From $14,184
Compare at $37,210
IGISave 88.5%15.02ct | Radiant | I | SI1 | Ideal
From $4,226
Compare at $36,799
IGISave 73.9%15.02ct | Radiant | F | VS2 | Ideal
From $6,927
Compare at $26,540
IGISave 70.1%15.02ct | Radiant | F | VVS2 | Very Good
From $11,528
Compare at $38,536
IGISave 70.1%15.02ct | Radiant | F | VVS2 | Excellent
From $11,528
Compare at $38,536
IGISave 86.8%15.02ct | Radiant | F | VS1 | Excellent
From $5,042
Compare at $38,245
IGISave 85.6%15.02ct | Radiant | F | VVS2 | Excellent
From $4,820
Compare at $33,530
IGISave 73.1%15.02ct | Radiant | FANCY | VS1 | Excellent
From $20,088
Compare at $74,758
IGISave 82.9%15.02ct | Radiant | F | VS1 | Ideal
From $5,624
Compare at $32,820
IGISave 26.5%15.02ct | Radiant | H | VS2 | Ideal
From $10,197
Compare at $13,877
IGISave 70.1%15.02ct | Radiant | F | VVS2 | Ideal
From $11,528
Compare at $38,536
IGISave 26.5%15.03ct | Radiant | H | VS2 | Ideal
From $10,203
Compare at $13,886
IGISave 74.3%15.03ct | Radiant | F | VS1 | Excellent
From $9,837
Compare at $38,268
IGISave 74.3%15.03ct | Radiant | F | VS1 | Excellent
From $9,837
Compare at $38,268
IGISave 87.3%15.03ct | Radiant | F | VVS2 | Ideal
From $5,042
Compare at $39,754
IGISave 61%15.03ct | Radiant | E | VVS2 | Very Good
From $15,733
Compare at $40,381
IGISave 86.8%15.03ct | Radiant | G | VVS2 | Excellent
From $3,919
Compare at $29,680
IGISave 12.3%15.03ct | Radiant | E | VS1 | Excellent
From $12,960
Compare at $14,779
IGISave 85.7%15.03ct | Radiant | G | VVS2 | Ideal
From $4,251
Compare at $29,730
IGISave 85.8%15.03ct | Radiant | F | VVS2 | Ideal
From $4,765
Compare at $33,500
IGI15.03ct | Radiant | E | VVS2 | Excellent
From $7,045
Compare at $7,770
IGISave 73.6%15.03ct | Radiant | F | VVS2 | Very Good
From $8,859
Compare at $33,500
IGISave 70.1%15.03ct | Radiant | F | VVS2 | Ideal
From $11,536
Compare at $38,559
IGISave 70.1%15.03ct | Radiant | F | VVS2 | Excellent
From $11,536
Compare at $38,559
IGISave 89.4%15.03ct | Radiant | F | VS1 | Excellent
From $4,196
Compare at $39,454
IGISave 99.4%15.03ct | Radiant | E | VS2 | Excellent
From $4,426
Compare at $683,865
IGISave 64.1%15.04ct | Radiant | G | VS2 | Ideal
From $13,615
Compare at $37,970
IGISave 86.8%15.04ct | Radiant | F | VS1 | Ideal
From $5,049
Compare at $38,293
IGISave 70.1%15.04ct | Radiant | F | VVS2 | Good
From $11,543
Compare at $38,585
IGISave 67.2%15.04ct | Radiant | G | VS2 | Ideal
From $12,467
Compare at $37,970
IGISave 25.3%15.04ct | Radiant | H | VS2 | Ideal
From $10,374
Compare at $13,895
IGISave 61%15.04ct | Radiant | E | VVS2 | Excellent
From $15,744
Compare at $40,408
IGISave 85.7%15.05ct | Radiant | G | VVS2 | Ideal
From $4,256
Compare at $29,770
IGISave 70.1%15.05ct | Radiant | F | VVS2 | Very Good
From $11,551
Compare at $38,613
IGISave 86.8%15.05ct | Radiant | G | VVS2 | Excellent
From $3,925
Compare at $29,720
IGISave 67.2%15.05ct | Radiant | G | VS2 | Ideal
From $12,475
Compare at $37,990
IGI15.05ct | Radiant | D | VVS2 | Very Good
From $19,456
Compare at $19,541
IGISave 70.1%15.05ct | Radiant | F | VVS2 | Ideal
From $11,551
Compare at $38,613
IGISave 70.1%15.05ct | Radiant | F | VVS2 | Ideal
From $11,551
Compare at $38,613
IGISave 87.1%15.05ct | Radiant | F | VVS2 | Excellent
From $4,318
Compare at $33,590
15.05ct | Radiant | E | VS1 | Ideal
From $7,732
Compare at $41,388
Entry pricing in this category starts around $3,919.
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 $16,169 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 $10,010 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 50 comparable stones in this segment. Prices start around $3,919 and go up to $20,088.
Based on the latest market data, the average asking price is about $9,308 with a median around $10,010.
The observed spread is roughly $16,169 across tracked listings, which is about 80.5% 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 $10,010, 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 4 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 $16,169 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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