1.8 Carat Radiant Lab Grown Diamond Prices Comparison
As of May 2026, 1.8 carat radiant lab grown diamonds usually range from $253 to $6,210, with an average price of $1,314.In the last month, prices for these diamonds are down 3%.Compare 621 verified listings across 11 retailers tracked by CaratRadar.
1.8 Carat Radiant Lab Grown Diamond Market Overview
CaratRadar currently tracks 621 verified 1.8-carat radiant lab grown diamonds listed across 11 online retailers. Prices in this segment range from $253 to $6,210, with an average asking price of $1,314 and a median of $1,018.
The price spread of $5,957 (95.9% 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.
621 diamonds tracked in this segment
Price range: $253 to $6,210
Average price: $1,314
Median price: $1,018
Available across 11 retailers
Savings potential: up to 95.9%
Price Range Overview
As of May 29, 2026Real market range for this carat, shape, and diamond type.
621
$253
$1,314
$1,018
$6,210
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 66.3%IGI | 1.81ct | Radiant | E | VVS2 | Very Good
From $258
Compare at $765
Save 64.4%IGI | 1.82ct | Radiant | D | VS1 | Very Good
From $260
Compare at $730
Save 49.1%IGI | 1.85ct | Radiant | E | VVS2 | Very Good
From $264
Compare at $518
Save 68.5%IGI | 1.88ct | Radiant | E | VS2 | Very Good
From $295
Compare at $936
Save 78.4%IGI | 1.85ct | Radiant | H | VS1 | Excellent
From $317
Compare at $1,470
Save 66.5%IGI | 1.87ct | Radiant | E | VS1 | Very Good
From $320
Compare at $956
Save 64.9%IGI | 1.82ct | Radiant | E | VS1 | Ideal
From $323
Compare at $920
Save 64.9%IGI | 1.82ct | Radiant | E | VS1 | Very Good
From $323
Compare at $920
Save 66.2%IGI | 1.83ct | Radiant | F | VS1 | Very Good
From $326
Compare at $964
Save 66.7%IGI | 1.88ct | Radiant | E | VS1 | Very Good
From $326
Compare at $979
Save 65.1%IGI | 1.84ct | Radiant | E | VS1 | Ideal
From $328
Compare at $939
Save 65.1%IGI | 1.84ct | Radiant | E | VS1 | Ideal
From $328
Compare at $939
Save 65.1%IGI | 1.84ct | Radiant | E | VS1 | Very Good
From $328
Compare at $939
Save 65.1%IGI | 1.84ct | Radiant | E | VS1 | Ideal
From $328
Compare at $939
Save 65.1%IGI | 1.84ct | Radiant | E | VS1 | Ideal
From $328
Compare at $939
Save 65.1%IGI | 1.84ct | Radiant | E | VS1 | Ideal
From $328
Compare at $939
Save 70.9%IGI | 1.82ct | Radiant | E | VVS2 | Excellent
From $328
Compare at $1,127
Save 65.3%IGI | 1.85ct | Radiant | E | VS1 | Very Good
From $329
Compare at $948
Save 66%IGI | 1.89ct | Radiant | E | VS1 | Ideal
From $336
Compare at $988
Save 66%IGI | 1.89ct | Radiant | E | VS1 | Ideal
From $336
Compare at $988
Save 66%IGI | 1.89ct | Radiant | E | VS1 | Very Good
From $336
Compare at $988
Save 66%IGI | 1.89ct | Radiant | E | VS1 | Ideal
From $336
Compare at $988
Save 67.9%IGI | 1.82ct | Radiant | D | VVS2 | Very Good
From $340
Compare at $1,058
Save 64.4%IGI | 1.84ct | Radiant | D | VS1 | Ideal
From $344
Compare at $965
Save 69.1%IGI | 1.87ct | Radiant | D | VVS2 | Ideal
From $344
Compare at $1,113
Save 69.2%IGI | 1.88ct | Radiant | D | VVS2 | Very Good
From $346
Compare at $1,124
Save 62.9%IGI | 1.84ct | Radiant | E | VS1 | Very Good
From $347
Compare at $935
Save 61.3%IGI | 1.83ct | Radiant | G | VVS2 | Ideal
From $354
Compare at $914
Save 74.2%IGI | 1.82ct | Radiant | F | VS1 | Very Good
From $356
Compare at $1,380
Save 59.7%IGI | 1.88ct | Radiant | G | VS1 | Very Good
From $363
Compare at $900
Save 74.4%IGI | 1.87ct | Radiant | F | VS1 | Ideal
From $364
Compare at $1,420
Save 79.9%IGI | 1.81ct | Radiant | F | VVS2 | Very Good
From $366
Compare at $1,820
Save 73.2%IGI | 1.86ct | Radiant | E | VS2 | Excellent
From $368
Compare at $1,375
Save 61.3%IGI | 1.83ct | Radiant | F | VS1 | Ideal
From $372
Compare at $960
Save 71.9%IGI | 1.82ct | Radiant | FANCY | VS1 | Excellent
From $372
Compare at $1,325
Save 71.9%IGI | 1.84ct | Radiant | FANCY | VS1 | Very Good
From $376
Compare at $1,339
Save 57%IGI | 1.84ct | Radiant | G | VVS2 | Very Good
From $376
Compare at $874
Save 79.6%IGI | 1.87ct | Radiant | F | VVS2 | Excellent
From $384
Compare at $1,880
Save 71.9%IGI | 1.85ct | Radiant | FANCY | VS2 | Very Good
From $386
Compare at $1,376
Save 62.3%IGI | 1.89ct | Radiant | F | VVS2 | Very Good
From $386
Compare at $1,024
Save 52.2%IGI | 1.89ct | Radiant | I | VVS2 | Ideal
From $388
Compare at $811
Save 58.7%IGI | 1.85ct | Radiant | E | VS1 | Very Good
From $390
Compare at $944
Save 71.4%IGI | 1.87ct | Radiant | FANCY | VVS2 | Very Good
From $391
Compare at $1,366
Save 71.9%IGI | 1.82ct | Radiant | FANCY | VS1 | Excellent
From $393
Compare at $1,398
Save 77.2%IGI | 1.84ct | Radiant | G | VS1 | Ideal
From $393
Compare at $1,720
Save 50.1%IGI | 1.84ct | Radiant | D | VS2 | Ideal
From $394
Compare at $789
Save 50%IGI | 1.87ct | Radiant | F | SI2 | Excellent
From $395
Compare at $790
Save 60%IGI | 1.85ct | Radiant | F | VVS2 | Very Good
From $395
Compare at $987
Save 75.7%IGI | 1.87ct | Radiant | D | VS1 | Ideal
From $395
Compare at $1,625
Save 79.2%IGI | 1.83ct | Radiant | F | VS1 | Ideal
From $396
Compare at $1,900
Entry pricing in this category starts around $253.
What to Know When Shopping for 1.8 Carat Radiant Lab Grown Diamonds
- Always compare identical certified diamonds across retailers. Identical certificate numbers can have price differences of $5,957 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 $1,018 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 621 comparable stones in this segment. Prices start around $253 and go up to $6,210.
Based on the latest market data, the average asking price is about $1,314 with a median around $1,018.
The observed spread is roughly $5,957 across tracked listings, which is about 95.9% 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 $1,314. The median price is $1,018, 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 11 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 $5,957 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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