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Round|Lab Grown|IGI

1.23ct G SI2 Round Lab Grown Diamond

ID • G/SI2 • IGI LG490195521

Shape and cutting style on the report: Round brilliant

Certificate IGI LG490195521

Diamond specifications and retailer prices

From $237 USD
As of November 4, 2026
Save $892 USD (79%) vs most expensive(unlock to see where)
8 retailers carry this diamond
Most expensive: $1,129 USD at MOH London · As of November 5, 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 SI2 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG490195521 or 490195521. Listed at 8 retailers as of November 4, 2026, with prices from $237 to $1,129, a $892 spread on the same certified stone. MOH London lists it at $1,129. 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
Color
SI2
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33.4°
Pavilion angle41.1°
OriginLab Grown
Grading LabIGI
CertificateIGI LG490195521
Dimensions7.02 × 6.98 × 4.19 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Cert comments
As Grown - No indication of post-growth treatment This Laboratory Grown Diamond was created by High Pressure High Temperature (HPHT) growth process Type II
Top View
7.02 mm6.98 mm1.23 ctG / SI2
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG490195521
Side View
Table 59.0%Crown 33.4°Girdle: THN-MEDPavilion 41.1°Culet: NoneDepth 59.9%

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 4
Current: $1,129 USD|Low: $169 USD|High: $1,138 USD|Avg: $476 USD|+7.2%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 6, 2026
Retailer 8$237 USD
Retailer 6$242 USD
Retailer 4$296 USD
Retailer 3$410 USD
Retailer 7$422 USD
Retailer 2$436 USD
Retailer 5$563 USD
MOH London$1,129 USD

41 data points across 8 retailers

8 retailers$237 USD to $1,129 USD

A
Cheapest Retailer
-
$237 USD
Final sale: no returns
Retailer 2
-
$242 USD
View
Price last confirmed 21 days ago
A
Retailer 3
-
$296 USD
View
B+
Retailer 4
-
$410 USD
View
B+
Retailer 5
-
$422 USD
View
B+
Retailer 6
-
$436 USD
View
B
Retailer 7
-
$563 USD
View
Most Expensive
B
MOH London
LG490195521 · Nov 5
$1,129 USD
£889 GBP
View
7 more retailers have this diamond
Prices start from $237 USDSave up to $892 USD

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
$237 USD