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1.23ct G SI1 Round Lab Grown Diamond

EX • G/SI1 • IGI LG598307797

Shape and cutting style on the report: Round brilliant

Certificate IGI LG598307797

Diamond specifications and retailer prices

From $585 NZD
As of November 5, 2026
Save $1,197 NZD (67%) vs most expensive(unlock to see where)
6 retailers carry this diamond
Most expensive: $1,783 NZD at MOH London · As of November 2, 2026
View at MOH London

About this 1.23ct lab-grown round diamond

This 1.23ct lab-grown round sits in the classic one-carat band, graded G colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG598307797 or 598307797. Listed at 6 retailers as of November 2, 2026, with prices from $585 to $1,783, a $1,197 spread on the same certified stone. MOH London lists it at $1,783. 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

1.23
Carat
G
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle32.6°
Pavilion angle41.4°
OriginLab Grown
Grading LabIGI
CertificateIGI LG598307797
Dimensions6.95 × 6.97 × 4.18 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
6.95 mm6.97 mm1.23 ctG / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG598307797
Side View
Table 59.0%Crown 32.6°Girdle: MediumPavilion 41.4°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: Nov 5
Current: $1,783 NZD|Low: $583 NZD|High: $1,805 NZD|Avg: $871 NZD|-0.1%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
November 6, 2026
Retailer 6$585 NZD
Retailer 4$628 NZD
Retailer 2$669 NZD
Retailer 3$676 NZD
Retailer 5$793 NZD
MOH London$1,783 NZD

39 data points across 6 retailers

6 retailers$585 NZD to $1,783 NZD

A
Cheapest Retailer
-
$585 NZD
B+
Retailer 2
-
$628 NZD
View
A
Retailer 3
-
$669 NZD
View
A
Retailer 4
-
$676 NZD
View
B+
Retailer 5
-
$793 NZD
View
Most Expensive
B
MOH London
LG598307797 · Nov 2
$1,783 NZD
£789 GBP
View
5 more retailers have this diamond
Prices start from $585 NZDSave up to $1,197 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
1.23ct Round
$585 NZD