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Round|Lab Grown|IGI

1.23ct E SI1 Round Lab Grown Diamond

ID • E/SI1 • IGI LG729575214

Shape and cutting style on the report: Round brilliant

Certificate IGI LG729575214

Diamond specifications and retailer prices

From £119 GBP
As of November 5, 2026
Save £570 GBP (83%) vs most expensive(unlock to see where)
17 retailers carry this diamond
Most expensive: £689 GBP at MOH London · As of November 1, 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 LG729575214 or 729575214. Listed at 17 retailers as of November 1, 2026, with prices from £119 to £689, a £570 spread on the same certified stone. MOH London lists it at £689. 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 angle35°
Pavilion angle40.9°
OriginLab Grown
Grading LabIGI
CertificateIGI LG729575214
Dimensions6.88 × 6.85 × 4.24 mm
L/W Ratio1.00
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
6.88 mm6.85 mm1.23 ctE / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG729575214
Side View
Table 58.0%Crown 35°Girdle: MediumPavilion 40.9°Culet: NoneDepth 61.7%

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: £689 GBP|Low: £113 GBP|High: £693 GBP|Avg: £317 GBP|+1.2%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
Retailer 14
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Retailer 17
November 6, 2026
Retailer 4£119 GBP
Retailer 3£132 GBP
Retailer 13£137 GBP
Retailer 15£147 GBP
Retailer 16£147 GBP
Retailer 2£254 GBP
Retailer 11£257 GBP
Retailer 8£267 GBP
Retailer 14£282 GBP
Retailer 10£331 GBP
Retailer 12£346 GBP
Retailer 7£389 GBP
Retailer 9£424 GBP
Retailer 5£473 GBP
Retailer 17£500 GBP
Retailer 6£514 GBP
MOH London£689 GBP

46 data points across 17 retailers

17 retailers£119 GBP to £689 GBP

A
Cheapest Retailer
-
£119 GBP
A
Retailer 2
-
£132 GBP
View
Final sale: no returns
A
Retailer 3
-
£137 GBP
View
Retailer 4
-
£147 GBP
View
Price last confirmed 12 days ago
A
Retailer 5
-
£147 GBP
View
A
Retailer 6
-
£254 GBP
View
A
Retailer 7
-
£257 GBP
View
B+
Retailer 8
-
£267 GBP
View
A
Retailer 9
-
£282 GBP
View
B+
Retailer 10
-
£331 GBP
View
B+
Retailer 11
-
£346 GBP
View
B+
Retailer 12
-
£389 GBP
View
B+
Retailer 13
-
£424 GBP
View
B
Retailer 14
-
£473 GBP
View
B
Retailer 15
-
£500 GBP
View
B
Retailer 16
-
£514 GBP
View
Most Expensive
B
MOH London
LG729575214 · Nov 1
£689 GBP
View
16 more retailers have this diamond
Prices start from £119 GBPSave up to £570 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
£119 GBP