6.3 Carat Radiant Lab Grown Diamond Prices Comparison
As of April 2026, 6.3 carat radiant lab grown diamonds usually range from $875 to $57,257, with an average price of $5,415.In the last month, prices for these diamonds are down 0.2%.Compare 30 verified listings across 5 retailers tracked by CaratRadar.
6.3 Carat Radiant Lab Grown Diamond Market Overview
CaratRadar currently tracks 30 verified 6.3-carat radiant lab grown diamonds listed across 5 online retailers. Prices in this segment range from $875 to $57,257, with an average asking price of $5,415 and a median of $4,060.
The price spread of $56,382 (98.5% 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.
30 diamonds tracked in this segment
Price range: $875 to $57,257
Average price: $5,415
Median price: $4,060
Available across 5 retailers
Savings potential: up to 98.5%
Price Range Overview
As of Apr 13, 2026Real market range for this carat, shape, and diamond type.
30
$875
$5,415
$4,061
$57,257
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 38.6%GIA | 6.3ct | Radiant | F | VS2 | Ideal
From $7,446
Compare at $12,128
Save 70.9%IGI | 6.3ct | Radiant | G | VS1 | Ideal
From $1,886
Compare at $6,480
Save 71.4%IGI | 6.3ct | Radiant | F | VS2 | Ideal
From $2,743
Compare at $9,600
Save 29%IGI | 6.3ct | Radiant | H | VS1 | Ideal
From $1,287
Compare at $1,811
IGI | 6.3ct | Radiant | FANCY | VS2 | Very Good
From $4,465
Compare at $6,368
Save 84.3%IGI | 6.3ct | Radiant | F | VS1 | Excellent
From $2,044
Compare at $13,040
Save 72%IGI | 6.3ct | Radiant | E | VVS2 | Ideal
From $4,390
Compare at $15,670
GIA | 6.31ct | Radiant | I | VS1 | Ideal
From $6,012
Compare at $6,015
Save 99.4%IGI | 6.31ct | Radiant | H | VS1 | Excellent
From $1,175
Compare at $211,385
Save 85.2%IGI | 6.31ct | Radiant | F | VVS2 | Excellent
From $2,090
Compare at $14,150
Save 82.6%IGI | 6.31ct | Radiant | F | VS1 | Ideal
From $2,263
Compare at $12,980
Save 74.6%IGI | 6.33ct | Radiant | F | VVS2 | Excellent
From $2,097
Compare at $8,240
Save 72.5%GIA | 6.34ct | Radiant | F | VS2 | Ideal
From $3,428
Compare at $12,460
Save 73.8%GIA | 6.34ct | Radiant | D | IF | Excellent
From $47,777
Compare at $182,220
Save 86.2%IGI | 6.34ct | Radiant | F | VVS2 | Excellent
From $1,968
Compare at $14,210
Save 29%IGI | 6.35ct | Radiant | H | VS1 | Ideal
From $1,316
Compare at $1,853
IGI | 6.35ct | Radiant | FANCY | VS1 | Very Good
From $4,115
Compare at $5,869
Save 60.7%IGI | 6.35ct | Radiant | FANCY | VS1 | Excellent
From $6,546
Compare at $16,642
Save 70.2%IGI | 6.35ct | Radiant | E | VS1 | Very Good
From $3,201
Compare at $10,760
Save 56.1%GIA | 6.36ct | Radiant | E | VS1 | Ideal
From $16,130
Compare at $36,760
Save 73.8%GIA | 6.36ct | Radiant | D | IF | Excellent
From $47,928
Compare at $182,790
Save 72.8%IGI | 6.36ct | Radiant | G | VS1 | Ideal
From $1,904
Compare at $7,010
Save 76.3%IGI | 6.36ct | Radiant | G | VS2 | Very Good
From $1,735
Compare at $7,330
Save 79.4%IGI | 6.36ct | Radiant | F | IF | Excellent
From $16,868
Compare at $81,966
Save 76.3%IGI | 6.37ct | Radiant | G | VS2 | Very Good
From $1,740
Compare at $7,340
Save 76.5%IGI | 6.39ct | Radiant | G | VS1 | Very Good
From $1,875
Compare at $7,980
Save 83.2%IGI | 6.39ct | Radiant | F | VS1 | Ideal
From $2,208
Compare at $13,140
Save 83.2%IGI | 6.4ct | Radiant | G | VS2 | Excellent
From $1,763
Compare at $10,470
Save 86%IGI | 6.4ct | Radiant | F | VS1 | Excellent
From $1,850
Compare at $13,240
Save 89.7%IGI | 6.4ct | Radiant | F | VVS2 | Ideal
From $1,470
Compare at $14,340
Entry pricing in this category starts around $875.
What to Know When Shopping for 6.3 Carat Radiant Lab Grown Diamonds
- Always compare identical certified diamonds across retailers. Identical certificate numbers can have price differences of $56,382 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 $4,060 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 30 comparable stones in this segment. Prices start around $875 and go up to $57,257.
Based on the latest market data, the average asking price is about $5,415 with a median around $4,060.
The observed spread is roughly $56,382 across tracked listings, which is about 98.5% 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 $4,060, 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 5 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 $56,382 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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