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1.23ct E SI1 Round Lab Grown Diamond

ID • E/SI1 • IGI LG792617957

Shape and cutting style on the report: Round brilliant

Certificate IGI LG792617957

Diamond specifications and retailer prices

From £230 GBP
As of November 5, 2026
Save £660 GBP (74%) vs most expensive(unlock to see where)
7 retailers carry this diamond
Most expensive: £890 GBP 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 E colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG792617957 or 792617957. Listed at 7 retailers as of November 5, 2026, with prices from £230 to £890, a £660 spread on the same certified stone. MOH London lists it at £890. 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
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33.4°
Pavilion angle40.9°
OriginLab Grown
Grading LabIGI
CertificateIGI LG792617957
Dimensions7.00 × 7.03 × 4.17 mm
L/W Ratio1.00
Girdle conditionFaceted
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
7.00 mm7.03 mm1.23 ctE / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG792617957
Side View
Table 59.0%Crown 33.4°Girdle: THN-MEDPavilion 40.9°Culet: NoneDepth 59.4%

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 5
Current: £890 GBP|Low: £220 GBP|High: £896 GBP|Avg: £513 GBP|+14.7%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
November 6, 2026
Retailer 3£230 GBP
Retailer 6£345 GBP
Retailer 2£414 GBP
Retailer 4£438 GBP
Retailer 7£592 GBP
Retailer 5£842 GBP
MOH London£890 GBP

33 data points across 7 retailers

7 retailers£230 GBP to £890 GBP

A
Cheapest Retailer
-
£230 GBP
B+
Retailer 2
-
£345 GBP
View
B
Retailer 3
-
£414 GBP
View
B+
Retailer 4
-
£438 GBP
View
B
Retailer 5
-
£592 GBP
View
B
Retailer 6
-
£842 GBP
View
Most Expensive
B
MOH London
LG792617957 · Nov 5
£890 GBP
View
6 more retailers have this diamond
Prices start from £230 GBPSave up to £660 GBP

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
£230 GBP