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Radiant|Lab Grown|IGI

1.05ct E SI1 Radiant Lab Grown Diamond

ID • E/SI1 • IGI LG644499133

Shape and cutting style on the report: Cut cornered square modified brilliant

Certificate IGI LG644499133

Diamond specifications and retailer prices

From £143 GBP
$191 USD
As of October 25, 2026
Save £524 GBP (79%) vs most expensive(unlock to see where)
8 retailers carry this diamond
Most expensive: £666 GBP at MOH London · As of October 25, 2026
View at MOH London

About this 1.05ct lab-grown radiant diamond

This 1.05ct lab-grown radiant 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 LG644499133 or 644499133. Listed at 8 retailers as of October 25, 2026, with prices from £143 to £666, a £524 spread on the same certified stone. MOH London lists it at £666. 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

1.05
Carat
E
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle41.8°
Pavilion angle39.1°
OriginLab Grown
Grading LabIGI
CertificateIGI LG644499133
Dimensions5.73 × 5.72 × 3.88 mm
L/W Ratio1.00
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
5.73 mm5.72 mm1.05 ctE / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG644499133
Side View
Table 64.0%Crown 41.8°Girdle: MediumPavilion 39.1°Culet: NoneDepth 67.8%

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 25
Current: £666 GBP|Low: £143 GBP|High: £1,047 GBP|Avg: £376 GBP|-35.7%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
October 28, 2026
Retailer 3£143 GBP
Retailer 5£186 GBP
Retailer 4£242 GBP
Retailer 7£260 GBP
Retailer 2£270 GBP
Retailer 9£357 GBP
Retailer 6£381 GBP
Retailer 8£440 GBP
MOH London£666 GBP

23 data points across 9 retailers

8 retailers£143 GBP to £666 GBP

A
Cheapest Retailer
-
£143 GBP
$191 USD
Retailer 2
-
£186 GBP
View
Price last confirmed 13 days ago
A
Retailer 3
-
£242 GBP
€309 EUR
View
B+
Retailer 4
-
£260 GBP
$348 USD
View
A
Retailer 5
-
£270 GBP
View
B+
Retailer 6
-
£381 GBP
$511 USD
View
B
Retailer 7
-
£519 GBP
View
Most Expensive
B
MOH London
LG644499133 · Oct 25
£666 GBP
View
7 more retailers have this diamond
Prices start from £143 GBPSave up to £524 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
1.05ct Radiant
£143 GBP