5.1 Carat Radiant Lab Grown Diamond Prices Comparison
As of May 2026, 5.1 carat radiant lab grown diamonds usually range from $559 to $19,997, with an average price of $3,746.In the last month, prices for these diamonds are down 3.2%.Compare 168 verified listings across 7 retailers tracked by CaratRadar.
5.1 Carat Radiant Lab Grown Diamond Market Overview
CaratRadar currently tracks 168 verified 5.1-carat radiant lab grown diamonds listed across 7 online retailers. Prices in this segment range from $559 to $19,997, with an average asking price of $3,746 and a median of $2,712.
The price spread of $19,438 (97.2% 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.
168 diamonds tracked in this segment
Price range: $559 to $19,997
Average price: $3,746
Median price: $2,712
Available across 7 retailers
Savings potential: up to 97.2%
Price Range Overview
As of May 30, 2026Real market range for this carat, shape, and diamond type.
168
$559
$3,746
$2,712
$19,997
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 72%IGI | 5.1ct | Radiant | E | SI1 | Very Good
From $744
Compare at $2,657
Save 60%IGI | 5.1ct | Radiant | H | VS1 | Very Good
From $848
Compare at $2,122
Save 60.6%IGI | 5.1ct | Radiant | F | SI1 | Ideal
From $889
Compare at $2,257
Save 61.4%IGI | 5.16ct | Radiant | G | VS2 | Ideal
From $920
Compare at $2,385
IGI | 5.1ct | Radiant | G | VS1 | Very Good
From $932
Compare at $945
Save 65.1%IGI | 5.11ct | Radiant | F | VS1 | Very Good
From $978
Compare at $2,801
Save 71.1%IGI | 5.1ct | Radiant | F | VVS2 | Excellent
From $1,017
Compare at $3,520
Save 58.9%IGI | 5.15ct | Radiant | F | VS1 | Very Good
From $1,021
Compare at $2,484
IGI | 5.19ct | Radiant | F | VVS2 | Very Good
From $1,023
Compare at $1,077
Save 58%IGI | 5.1ct | Radiant | F | VS1 | Excellent
From $1,025
Compare at $2,438
Save 61.1%IGI | 5.15ct | Radiant | E | VS1 | Very Good
From $1,039
Compare at $2,673
Save 58.1%IGI | 5.17ct | Radiant | G | VS1 | Very Good
From $1,045
Compare at $2,496
Save 60.5%IGI | 5.1ct | Radiant | E | VS1 | Excellent
From $1,052
Compare at $2,665
Save 30.9%IGI | 5.13ct | Radiant | H | VS2 | Ideal
From $1,085
Compare at $1,571
Save 25.4%IGI | 5.19ct | Radiant | F | VS1 | Ideal
From $1,091
Compare at $1,463
Save 58.8%IGI | 5.16ct | Radiant | F | VVS2 | Very Good
From $1,091
Compare at $2,649
Save 55%IGI | 5.13ct | Radiant | G | VS1 | Very Good
From $1,096
Compare at $2,433
Save 55.4%IGI | 5.1ct | Radiant | F | VS1 | Excellent
From $1,097
Compare at $2,461
Save 59.2%IGI | 5.13ct | Radiant | E | VS1 | Very Good
From $1,098
Compare at $2,693
Save 24%IGI | 5.1ct | Radiant | F | VVS2 | Very Good
From $1,102
Compare at $1,451
Save 54.9%IGI | 5.16ct | Radiant | G | VS2 | Very Good
From $1,103
Compare at $2,445
Save 53.7%IGI | 5.11ct | Radiant | G | VS2 | Very Good
From $1,114
Compare at $2,406
Save 29.3%IGI | 5.1ct | Radiant | E | VS1 | Very Good
From $1,134
Compare at $1,604
Save 56.7%IGI | 5.1ct | Radiant | E | VS1 | Very Good
From $1,150
Compare at $2,653
Save 71.8%IGI | 5.1ct | Radiant | E | VS1 | Ideal
From $1,163
Compare at $4,130
Save 55.3%IGI | 5.1ct | Radiant | F | VVS2 | Very Good
From $1,170
Compare at $2,617
Save 55.3%IGI | 5.1ct | Radiant | F | VVS2 | Very Good
From $1,170
Compare at $2,617
Save 45.1%IGI | 5.1ct | Radiant | E | VS1 | Excellent
From $1,170
Compare at $2,133
Save 71.6%IGI | 5.1ct | Radiant | E | VS1 | Ideal
From $1,174
Compare at $4,130
Save 78.1%IGI | 5.1ct | Radiant | E | VVS2 | Excellent
From $1,185
Compare at $5,405
Save 31.3%IGI | 5.1ct | Radiant | E | VVS2 | Ideal
From $1,185
Compare at $1,726
IGI | 5.1ct | Radiant | E | VVS2 | Ideal
From $1,195
Compare at $1,287
IGI | 5.1ct | Radiant | E | VVS2 | Ideal
From $1,201
Compare at $1,247
Save 56.3%IGI | 5.1ct | Radiant | E | VVS2 | Ideal
From $1,221
Compare at $2,797
Save 74.3%IGI | 5.1ct | Radiant | H | VVS2 | Excellent
From $1,247
Compare at $4,850
Save 54.9%IGI | 5.1ct | Radiant | E | VVS2 | Excellent
From $1,251
Compare at $2,774
Save 54.6%IGI | 5.1ct | Radiant | E | VVS2 | Excellent
From $1,262
Compare at $2,777
Save 54.6%IGI | 5.1ct | Radiant | E | VVS2 | Excellent
From $1,262
Compare at $2,777
Save 54.6%IGI | 5.1ct | Radiant | E | VVS2 | Excellent
From $1,262
Compare at $2,777
Save 54.6%IGI | 5.1ct | Radiant | E | VVS2 | Excellent
From $1,262
Compare at $2,777
Save 54.6%IGI | 5.1ct | Radiant | E | VVS2 | Excellent
From $1,262
Compare at $2,777
Save 78.4%IGI | 5.1ct | Radiant | E | VS2 | Very Good
From $1,265
Compare at $5,850
Save 25.7%IGI | 5.1ct | Radiant | E | VVS2 | Ideal
From $1,271
Compare at $1,711
Save 25.7%IGI | 5.1ct | Radiant | E | VVS2 | Ideal
From $1,271
Compare at $1,711
Save 25.7%IGI | 5.1ct | Radiant | E | VVS2 | Ideal
From $1,271
Compare at $1,711
IGI | 5.1ct | Radiant | E | VVS2 | Very Good
From $1,272
Compare at $1,320
Save 26.1%IGI | 5.1ct | Radiant | E | VVS2 | Ideal
From $1,276
Compare at $1,726
Save 45.3%IGI | 5.1ct | Radiant | G | VS1 | Excellent
From $1,294
Compare at $2,364
Save 45.3%IGI | 5.1ct | Radiant | G | VS1 | Excellent
From $1,294
Compare at $2,364
Save 41.1%IGI | 5.14ct | Radiant | E | VVS2 | Excellent
From $1,298
Compare at $2,203
Entry pricing in this category starts around $559.
What to Know When Shopping for 5.1 Carat Radiant Lab Grown Diamonds
- Always compare identical certified diamonds across retailers. Identical certificate numbers can have price differences of $19,438 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 $2,712 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 168 comparable stones in this segment. Prices start around $559 and go up to $19,997.
Based on the latest market data, the average asking price is about $3,746 with a median around $2,712.
The observed spread is roughly $19,438 across tracked listings, which is about 97.2% from highest to lowest offer in this bucket.
We refresh pricing data daily so these pages stay current with market changes.
Based on completed market data, the fair market benchmark is $3,746. The median price is $2,712, 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 7 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 $19,438 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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