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Round|Lab Grown|IGI

1.80ct J SI1 Round Lab Grown Diamond

ID • J/SI1 • IGI LG492113524

Shape and cutting style on the report: Round brilliant

Certificate IGI LG492113524

Diamond specifications and retailer prices

From $1,792 NZD
$1,010 USD
As of October 30, 2026
Save $3,561 NZD (67%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: $8,200 NZD at MOH London · As of October 19, 2026
View at MOH London

About this 1.8ct lab-grown round diamond

This 1.8ct lab-grown round sits in the one-and-a-half to two carat band, graded J colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG492113524 or 492113524. Listed at 12 retailers as of October 30, 2026, with a 199% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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

1.80
Carat
J
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33.1°
Pavilion angle40.1°
OriginLab Grown
Grading LabIGI
CertificateIGI LG492113524
Dimensions7.90 × 7.83 × 4.71 mm
L/W Ratio1.01
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
7.90 mm7.83 mm1.80 ctJ / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG492113524
Side View
Table 56.0%Crown 33.1°Girdle: MED-STKPavilion 40.1°Culet: NoneDepth 60.0%

Caratlytics Score

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

Price History

Last verified: Oct 30
Current: $8,200 NZD|Low: $1,792 NZD|High: $8,254 NZD|Avg: $3,819 NZD|+0.5%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
Retailer 14
October 30, 2026
Retailer 2$1,792 NZD
Retailer 8$2,463 NZD
Retailer 12$2,679 NZD
Retailer 11$2,757 NZD
Retailer 9$2,857 NZD
Retailer 14$2,857 NZD
Retailer 3$3,158 NZD
Retailer 6$3,746 NZD
Retailer 7$3,749 NZD
Retailer 5$3,923 NZD
Retailer 10$4,510 NZD
Retailer 4$5,183 NZD
Retailer 13$5,353 NZD
MOH London$8,200 NZD

36 data points across 14 retailers

12 retailers$1,792 NZD to $5,353 NZD

A
Cheapest Retailer
-
$1,792 NZD
$1,010 USD
B+
Retailer 2
-
$2,463 NZD
$1,388 USD
View
B+
Retailer 3
-
$2,679 NZD
$1,510 USD
View
B+
Retailer 4
-
$2,757 NZD
$1,554 USD
View
Final sale: no returns
B+
Retailer 5
-
$2,857 NZD
$1,610 USD
View
Retailer 6
-
$2,857 NZD
$1,610 USD
View
Price last confirmed 18 days ago
B+
Retailer 7
-
$3,158 NZD
$1,780 USD
View
B+
Retailer 8
-
$3,749 NZD
£1,664 GBP
View
B
Retailer 9
-
$4,510 NZD
$2,542 USD
View
B
Retailer 10
-
$5,183 NZD
$2,921 USD
View
B
Retailer 11
-
$5,353 NZD
$3,017 USD
View
Most Expensive
MOH London
LG492113524 · Oct 19
$8,200 NZD
£3,639 GBP
View
Price last confirmed 12 days ago
11 more retailers have this diamond
Prices start from $1,792 NZDSave up to $3,561 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
1.80ct Round
$1,792 NZD