1.8 Carat Radiant Lab Grown Diamond Prices Comparison
As of February 2026, 1.8 carat radiant lab grown diamonds usually range from $392 to $6,530, with an average price of $948.In the last month, prices for these diamonds are down 3%.Compare 1,486 verified listings across 9 retailers tracked by CaratRadar.
1.8 Carat Radiant Lab Grown Diamond Market Overview
CaratRadar currently tracks 1,486 verified 1.8-carat radiant lab grown diamonds listed across 9 online retailers. Prices in this segment range from $392 to $6,530, with an average asking price of $948 and a median of $659.
The price spread of $6,138 (94.0% 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.
1,486 diamonds tracked in this segment
Price range: $392 to $6,530
Average price: $948
Median price: $659
Available across 9 retailers
Savings potential: up to 94.0%
Price Range Overview
As of Feb 28, 2026Real market range for this carat, shape, and diamond type.
1,486
$392
$948
$659
$6,530
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 13.9%1.75ct | Radiant | E | VVS2 | Excellent
From $617
Compare at $716
IGISave 77.1%1.75ct | Radiant | F | VS1 | Ideal
From $606
Compare at $2,650
IGISave 64.1%1.75ct | Radiant | G | VS1 | Ideal
From $3,180
Compare at $8,852
IGISave 72.8%1.75ct | Radiant | G | VS1 | Very Good
From $512
Compare at $1,880
IGISave 69.2%1.75ct | Radiant | I | VS2 | Ideal
From $747
Compare at $2,427
IGISave 73.3%1.75ct | Radiant | G | SI1 | Very Good
From $440
Compare at $1,650
IGISave 32.9%1.75ct | Radiant | FANCY | VS2 | Very Good
From $633
Compare at $943
IGISave 65.6%1.75ct | Radiant | E | VS1 | Ideal
From $1,144
Compare at $3,328
IGISave 79.6%1.75ct | Radiant | E | VS1 | Ideal
From $511
Compare at $2,500
IGISave 77.9%1.75ct | Radiant | G | SI2 | Ideal
From $397
Compare at $1,800
IGISave 31.4%1.75ct | Radiant | D | VS1 | Ideal
From $745
Compare at $1,085
IGISave 76.9%1.75ct | Radiant | D | VS2 | Ideal
From $700
Compare at $3,030
IGISave 31.3%1.75ct | Radiant | E | VS1 | Ideal
From $700
Compare at $1,019
IGISave 73.2%1.75ct | Radiant | D | VS2 | Ideal
From $922
Compare at $3,440
IGISave 82.7%1.75ct | Radiant | D | VVS2 | Excellent
From $659
Compare at $3,810
IGISave 74%1.75ct | Radiant | E | VS2 | Ideal
From $701
Compare at $2,700
IGISave 68.8%1.75ct | Radiant | D | VS1 | Ideal
From $744
Compare at $2,380
IGISave 86.1%1.75ct | Radiant | D | VVS1 | Ideal
From $576
Compare at $4,150
IGISave 77.6%1.75ct | Radiant | D | VVS2 | Ideal
From $636
Compare at $2,840
IGISave 79.5%1.75ct | Radiant | D | VS1 | Ideal
From $526
Compare at $2,560
IGISave 10.3%1.75ct | Radiant | D | VS1 | Very Good
From $479
Compare at $534
IGISave 82.9%1.75ct | Radiant | E | VVS2 | Ideal
From $548
Compare at $3,210
GIASave 82%1.75ct | Radiant | D | VVS1 | Excellent
From $971
Compare at $5,410
GIASave 31%1.75ct | Radiant | G | VVS2 | Excellent
From $1,097
Compare at $1,591
GIASave 74.7%1.75ct | Radiant | D | VVS1 | Excellent
From $1,120
Compare at $4,420
GIASave 85.6%1.75ct | Radiant | H | VS1 | Excellent
From $849
Compare at $5,910
IGISave 60.3%1.75ct | Radiant | F | VS1 | Ideal
From $3,420
Compare at $8,611
IGISave 45.4%1.75ct | Radiant | H | VS1 | Excellent
From $847
Compare at $1,550
IGISave 72%1.75ct | Radiant | G | VVS2 | Very Good
From $588
Compare at $2,100
IGISave 76.5%1.75ct | Radiant | E | VS1 | Ideal
From $700
Compare at $2,975
IGISave 79.8%1.75ct | Radiant | E | VS2 | Ideal
From $469
Compare at $2,320
IGISave 75.9%1.75ct | Radiant | F | VS2 | Ideal
From $636
Compare at $2,640
IGISave 56.3%1.75ct | Radiant | F | VS1 | Very Good
From $561
Compare at $1,286
IGISave 72.9%1.75ct | Radiant | F | SI1 | Very Good
From $491
Compare at $1,810
IGISave 58.3%1.75ct | Radiant | E | VS1 | Ideal
From $1,225
Compare at $2,940
IGISave 44.9%1.75ct | Radiant | E | VS1 | Ideal
From $615
Compare at $1,117
IGISave 77.9%1.75ct | Radiant | F | VVS2 | Very Good
From $510
Compare at $2,310
IGISave 79.6%1.75ct | Radiant | E | VS1 | Ideal
From $511
Compare at $2,500
IGISave 76%1.75ct | Radiant | D | VS1 | Ideal
From $766
Compare at $3,190
IGISave 75.2%1.75ct | Radiant | G | VVS2 | Ideal
From $610
Compare at $2,460
IGISave 72.6%1.75ct | Radiant | E | VS1 | Ideal
From $537
Compare at $1,960
IGISave 76.9%1.75ct | Radiant | D | VS2 | Excellent
From $685
Compare at $2,970
IGISave 85.5%1.75ct | Radiant | E | VVS1 | Ideal
From $553
Compare at $3,820
IGISave 77.8%1.75ct | Radiant | F | VVS2 | Ideal
From $507
Compare at $2,290
IGISave 80.5%1.75ct | Radiant | D | VVS2 | Ideal
From $636
Compare at $3,260
GIASave 82.7%1.75ct | Radiant | E | VVS2 | Excellent
From $886
Compare at $5,110
GIASave 82.4%1.75ct | Radiant | E | VS1 | Excellent
From $854
Compare at $4,860
IGISave 45.7%1.75ct | Radiant | D | VVS2 | Very Good
From $639
Compare at $1,176
IGISave 82.4%1.75ct | Radiant | F | VS1 | Ideal
From $464
Compare at $2,640
IGISave 81.2%1.75ct | Radiant | E | VS2 | Very Good
From $505
Compare at $2,690
Entry pricing in this category starts around $392.
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 $6,138 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 $659 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 1,486 comparable stones in this segment. Prices start around $392 and go up to $6,530.
Based on the latest market data, the average asking price is about $948 with a median around $659.
The observed spread is roughly $6,138 across tracked listings, which is about 94.0% 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 $659, 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 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 $6,138 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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