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3.78ct F SI1 Round Lab Grown Diamond

ID • F/SI1 • IGI LG620425009

Shape and cutting style on the report: Round brilliant

Certificate IGI LG620425009

Diamond specifications and retailer prices

From $2,397 NZD
CA$1,873 CAD
As of November 2, 2026
Save $774 NZD (24%) vs most expensive(unlock to see where)
2 retailers carry this diamond
Most expensive: $3,171 NZD at The Diamond Guys · As of November 1, 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 F colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG620425009 or 620425009. Listed at 2 retailers as of November 1, 2026, with prices from $2,397 to $3,171, a $774 spread on the same certified stone. The Diamond Guys lists it at $3,171. SI-grade stones are eye-clean roughly 60 to 70% of the time at this carat range. Check the inclusion plot on the cert and ask the retailer for high-resolution video before buying.

The 4Cs

3.78
Carat
F
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.1°
Pavilion angle40.8°
OriginLab Grown
Grading LabIGI
CertificateIGI LG620425009
Dimensions10.14 × 10.09 × 6.10 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
10.14 mm10.09 mm3.78 ctF / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG620425009
Side View
Table 58.0%Crown 34.1°Girdle: MediumPavilion 40.8°Culet: NoneDepth 60.3%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 2
Current: $1,982 NZD|Low: $476 NZD|High: $5,776 NZD|Avg: $2,103 NZD|-8.4%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
The Diamond Guys
August 3, 2026
Retailer 2$1,297 NZD
Retailer 4$1,409 NZD
Retailer 7$1,578 NZD
Retailer 9$1,601 NZD
Retailer 6$1,856 NZD
Retailer 3$1,919 NZD
Retailer 1$1,982 NZD
Retailer 5$2,397 NZD
Retailer 10$3,110 NZD
The Diamond Guys$3,171 NZD
Retailer 8$4,941 NZD

59 data points across 11 retailers

2 retailers$2,397 NZD to $3,171 NZD

B+
Cheapest Retailer
-
$2,397 NZD
CA$1,873 CAD
Most Expensive
B
The Diamond Guys
1954434357 · Nov 1
$3,171 NZD
$1,784 USD
View
1 more retailer has this diamond
Prices start from $2,397 NZDSave up to $774 NZD

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
$2,397 NZD