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1.80ct J SI2 Round Lab Grown Diamond

EX • J/SI2 • IGI LG451057428

Shape and cutting style on the report: Round brilliant

Certificate IGI LG451057428

Diamond specifications and retailer prices

From $1,792 NZD
$1,010 USD
As of October 30, 2026
Save $6,498 NZD (78%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: $8,290 NZD at MOH London · As of October 27, 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 SI2 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG451057428 or 451057428. Listed at 10 retailers as of October 27, 2026, with prices from $1,792 to $8,290, a $6,498 spread on the same certified stone. MOH London lists it at $8,290. 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
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.4°
Pavilion angle40.2°
OriginLab Grown
Grading LabIGI
CertificateIGI LG451057428
Dimensions7.74 × 7.77 × 4.79 mm
L/W Ratio1.00
Girdle conditionFaceted
Culet sizePointed
Cert comments
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Top View
7.74 mm7.77 mm1.80 ctJ / SI2
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG451057428
Side View
Table 57.0%Crown 36.4°Girdle: MED-STKPavilion 40.2°Culet: NoneDepth 61.8%

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: $8,290 NZD|Low: $1,792 NZD|High: $8,392 NZD|Avg: $4,135 NZD|+0.1%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
October 30, 2026
Retailer 2$1,792 NZD
Retailer 3$2,221 NZD
Retailer 6$2,486 NZD
Retailer 4$2,576 NZD
Retailer 8$3,591 NZD
Retailer 5$4,084 NZD
Retailer 7$4,803 NZD
Retailer 9$5,763 NZD
MOH London$8,290 NZD

14 data points across 9 retailers

10 retailers$1,792 NZD to $8,290 NZD

A
Cheapest Retailer
-
$1,792 NZD
$1,010 USD
B+
Retailer 2
-
$2,221 NZD
$1,252 USD
View
B+
Retailer 3
-
$2,417 NZD
$1,362 USD
View
B+
Retailer 4
-
$2,486 NZD
$1,401 USD
View
Final sale: no returns
B+
Retailer 5
-
$2,576 NZD
$1,452 USD
View
Retailer 6
-
$2,576 NZD
$1,452 USD
View
Price last confirmed 19 days ago
B
Retailer 7
-
$4,084 NZD
$2,302 USD
View
B
Retailer 8
-
$4,803 NZD
$2,707 USD
View
B
Retailer 9
-
$4,831 NZD
$2,723 USD
View
Most Expensive
B
MOH London
LG451057428 · Oct 27
$8,290 NZD
£3,679 GBP
View
9 more retailers have this diamond
Prices start from $1,792 NZDSave up to $6,498 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