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1.40ct J SI1 Round Lab Grown Diamond

ID • J/SI1 • IGI LG451055673

Shape and cutting style on the report: Round brilliant

Certificate IGI LG451055673

Diamond specifications and retailer prices

From $1,178 NZD
As of November 5, 2026
Save $4,561 NZD (79%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: $5,738 NZD at MOH London · As of November 5, 2026
View at MOH London

About this 1.4ct lab-grown round diamond

This 1.4ct lab-grown round sits in the one-and-a-quarter to one-and-a-half carat band, graded J colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG451055673 or 451055673. Listed at 11 retailers as of November 5, 2026, with prices from $1,178 to $5,738, a $4,561 spread on the same certified stone. MOH London lists it at $5,738. 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

1.40
Carat
J
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.3°
Pavilion angle40.3°
OriginLab Grown
Grading LabIGI
CertificateIGI LG451055673
Dimensions7.26 × 7.21 × 4.36 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Cert comments
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Top View
7.26 mm7.21 mm1.40 ctJ / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG451055673
Side View
Table 58.5%Crown 35.3°Girdle: THN-MEDPavilion 40.3°Culet: NoneDepth 60.2%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 5
Current: $5,738 NZD|Low: $1,178 NZD|High: $5,824 NZD|Avg: $2,414 NZD|-0.3%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
November 5, 2026
Retailer 4$1,178 NZD
Retailer 8$1,318 NZD
Retailer 6$1,366 NZD
Retailer 2$1,681 NZD
Retailer 5$1,761 NZD
Retailer 9$2,213 NZD
Retailer 7$2,229 NZD
Retailer 3$3,490 NZD
MOH London$5,738 NZD

17 data points across 9 retailers

11 retailers$1,178 NZD to $5,738 NZD

A
Cheapest Retailer
-
$1,178 NZD
A
Retailer 2
-
$1,281 NZD
View
B+
Retailer 3
-
$1,318 NZD
View
Final sale: no returns
Retailer 4
-
$1,366 NZD
View
Price last confirmed 21 days ago
B+
Retailer 5
-
$1,366 NZD
View
B+
Retailer 6
-
$1,681 NZD
View
B
Retailer 7
-
$1,761 NZD
View
B
Retailer 8
-
$2,229 NZD
View
B
Retailer 9
-
$3,490 NZD
View
B
Retailer 10
-
$3,841 NZD
View
Most Expensive
B
MOH London
LG451055673 · Nov 5
$5,738 NZD
£2,540 GBP
View
10 more retailers have this diamond
Prices start from $1,178 NZDSave up to $4,561 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.

A
1.40ct Round
$1,178 NZD