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Round|Lab Grown|IGI

3.78ct H VS1 Round Lab Grown Diamond

ID • H/VS1 • IGI LG621406218

Shape and cutting style on the report: Round brilliant

Certificate IGI LG621406218

Diamond specifications and retailer prices

From $1,486 USD
CA$2,064 CAD
As of October 30, 2026
Save $480 USD (24%) vs most expensive(unlock to see where)
2 retailers carry this diamond
Most expensive: $1,966 USD at The Diamond Guys · As of October 30, 2026
View at The Diamond Guys

About this 3.78ct lab-grown round diamond

This 3.78ct lab-grown round sits in the three to five carat band, graded H colour (near-colourless) and VS1 clarity (very-slightly-included), with a top-tier cut grade and certified by IGI LG621406218 or 621406218. Listed at 2 retailers as of October 30, 2026, with prices from $1,486 to $1,966, a $480 spread on the same certified stone. The Diamond Guys lists it at $1,966. Lab-grown prices in the 2ct and up range have fallen 40 to 60% over the last 18 months. Use the cross-retailer spread above to find the lowest current listing.

The 4Cs

3.78
Carat
H
Color
VS1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.3°
Pavilion angle40.8°
OriginLab Grown
Grading LabIGI
CertificateIGI LG621406218
Dimensions10.08 × 10.03 × 6.13 mm
L/W Ratio1.00
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process and may include post-growth treatment Type IIa
Top View
10.08 mm10.03 mm3.78 ctH / VS1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG621406218
Side View
Table 58.0%Crown 34.3°Girdle: MediumPavilion 40.8°Culet: NoneDepth 61.0%

Caratlytics Score

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B+
Very Good
Strong quality and value balance
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Price History

Last verified: Oct 30
Current: $618 USD|Low: $289 USD|High: $3,530 USD|Avg: $1,344 USD|-13.6%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
The Diamond Guys
August 12, 2026
Retailer 12$314 USD
Retailer 1$618 USD
Retailer 5$640 USD
Retailer 4$750 USD
Retailer 2$824 USD
Retailer 8$914 USD
Retailer 10$992 USD
Retailer 9$1,256 USD
Retailer 11$1,364 USD
Retailer 3$1,486 USD
Retailer 7$1,899 USD
The Diamond Guys$1,966 USD
Retailer 6$3,530 USD

62 data points across 13 retailers

2 retailers$1,486 USD to $1,966 USD

B+
Cheapest Retailer
-
$1,486 USD
CA$2,064 CAD
Most Expensive
B
The Diamond Guys
1954433964 · Oct 30
$1,966 USD
View
1 more retailer has this diamond
Prices start from $1,486 USDSave up to $480 USD

Carat Hunter is not affiliated with, endorsed by, or sponsored by any retailer listed. Retailer information is from publicly available sources and may not be current. Verify details directly with the retailer before purchasing. Return terms as we hold them. Check the retailer's own returns page before you buy.

B+
3.78ct Round
$1,486 USD