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Round|Lab Grown|IGI

1.23ct D SI1 Round Lab Grown Diamond

EX • D/SI1 • IGI LG529269207

Shape and cutting style on the report: Round brilliant

Certificate IGI LG529269207

Diamond specifications and retailer prices

From £132 GBP
As of November 5, 2026
Save £629 GBP (83%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: £761 GBP at MOH London · As of November 2, 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 D colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG529269207 or 529269207. Listed at 11 retailers as of November 2, 2026, with prices from £132 to £761, a £629 spread on the same certified stone. MOH London lists it at £761. 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
D
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.5°
Pavilion angle40.2°
OriginLab Grown
Grading LabIGI
CertificateIGI LG529269207
Dimensions6.84 × 6.80 × 4.24 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
6.84 mm6.80 mm1.23 ctD / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG529269207
Side View
Table 57.0%Crown 36.5°Girdle: MED-STKPavilion 40.2°Culet: NoneDepth 62.2%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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Price History

Last verified: Nov 5
Current: £761 GBP|Low: £126 GBP|High: £1,022 GBP|Avg: £450 GBP|-1.1%
MOH London
Retailer 2
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Retailer 11
Retailer 12
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Retailer 17
November 6, 2026
Retailer 11£132 GBP
Retailer 15£147 GBP
Retailer 16£152 GBP
Retailer 17£256 GBP
Retailer 2£269 GBP
Retailer 13£288 GBP
Retailer 7£358 GBP
Retailer 5£406 GBP
Retailer 8£416 GBP
Retailer 6£435 GBP
Retailer 14£523 GBP
Retailer 9£527 GBP
Retailer 10£553 GBP
Retailer 12£713 GBP
Retailer 3£747 GBP
MOH London£761 GBP
Retailer 4£1,022 GBP

21 data points across 17 retailers

11 retailers£132 GBP to £761 GBP

A
Cheapest Retailer
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£132 GBP
A
Retailer 2
-
£147 GBP
View
Final sale: no returns
A
Retailer 3
-
£152 GBP
View
A
Retailer 4
-
£256 GBP
View
A
Retailer 5
-
£269 GBP
View
A
Retailer 6
-
£288 GBP
View
B
Retailer 7
-
£523 GBP
View
B
Retailer 8
-
£553 GBP
View
B
Retailer 9
-
£713 GBP
View
B
Retailer 10
-
£747 GBP
View
Most Expensive
B
MOH London
LG529269207 · Nov 2
£761 GBP
View
10 more retailers have this diamond
Prices start from £132 GBPSave up to £629 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
£132 GBP