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1.23ct E SI1 Round Lab Grown Diamond

EX • E/SI1 • IGI LG691548634

Shape and cutting style on the report: Round brilliant

Certificate IGI LG691548634

Diamond specifications and retailer prices

From $296 USD
As of October 30, 2026
Save $754 USD (72%) vs most expensive(unlock to see where)
6 retailers carry this diamond
Most expensive: $1,050 USD at MOH London · As of October 29, 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 E colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG691548634 or 691548634. Listed at 6 retailers as of October 29, 2026, with prices from $296 to $1,050, a $754 spread on the same certified stone. MOH London lists it at $1,050. 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
E
Color
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.4°
Pavilion angle41.5°
OriginLab Grown
Grading LabIGI
CertificateIGI LG691548634
Dimensions6.86 × 6.81 × 4.25 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
6.86 mm6.81 mm1.23 ctE / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG691548634
Side View
Table 59.0%Crown 34.4°Girdle: MED-STKPavilion 41.5°Culet: NoneDepth 62.2%

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: Oct 30
Current: $1,050 USD|Low: $296 USD|High: $1,058 USD|Avg: $480 USD|-0.6%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
November 1, 2026
Retailer 6$296 USD
Retailer 4$366 USD
Retailer 2$398 USD
Retailer 3$440 USD
Retailer 5$453 USD
MOH London$1,050 USD

40 data points across 6 retailers

6 retailers$296 USD to $1,050 USD

A
Cheapest Retailer
-
$296 USD
B+
Retailer 2
-
$366 USD
View
B+
Retailer 3
-
$398 USD
£314 GBP
View
Retailer 4
-
$440 USD
View
Price last confirmed 10 days ago
B+
Retailer 5
-
$453 USD
View
Most Expensive
B
MOH London
LG691548634 · Oct 29
$1,050 USD
£827 GBP
View
5 more retailers have this diamond
Prices start from $296 USDSave up to $754 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
$296 USD