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Marquise|Lab Grown|IGI

1.23ct E SI1 Marquise Lab Grown Diamond

ID • E/SI1 • IGI LG733544094

Shape and cutting style on the report: Marquise brilliant

Certificate IGI LG733544094

Diamond specifications and retailer prices

From £285 GBP
As of November 6, 2026
Save £466 GBP (62%) vs most expensive(unlock to see where)
7 retailers carry this diamond
Most expensive: £751 GBP at MOH London · As of November 5, 2026
View at MOH London

About this 1.23ct lab-grown marquise diamond

This 1.23ct lab-grown marquise 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 LG733544094 or 733544094. Listed at 7 retailers as of November 5, 2026, with prices from £285 to £751, a £466 spread on the same certified stone. MOH London lists it at £751. 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 angle36.5°
Pavilion angle39.7°
OriginLab Grown
Grading LabIGI
CertificateIGI LG733544094
Dimensions11.29 × 5.49 × 3.42 mm
L/W Ratio2.06
Girdle conditionFaceted
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
11.29 mm5.49 mm1.23 ctE / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG733544094
Side View
Table 60.0%Crown 36.5°Girdle: MED-STKPavilion 39.7°Culet: NoneDepth 62.3%

Caratlytics Score

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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 6
Current: £751 GBP|Low: £238 GBP|High: £761 GBP|Avg: £388 GBP|-1.1%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
November 6, 2026
Retailer 2£285 GBP
Retailer 3£287 GBP
Retailer 5£287 GBP
Retailer 6£305 GBP
Retailer 4£402 GBP
Retailer 7£487 GBP
MOH London£751 GBP

38 data points across 7 retailers

7 retailers£285 GBP to £751 GBP

A
Cheapest Retailer
-
£285 GBP
A
Retailer 2
-
£287 GBP
View
Retailer 3
-
£287 GBP
View
Price last confirmed 10 days ago
A
Retailer 4
-
£305 GBP
View
B+
Retailer 5
-
£402 GBP
View
Retailer 6
-
£487 GBP
View
Price last confirmed 43 days ago
Most Expensive
B
MOH London
LG733544094 · Nov 5
£751 GBP
View
6 more retailers have this diamond
Prices start from £285 GBPSave up to £466 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 Marquise
£285 GBP