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Radiant|Lab Grown|IGI

1.21ct E SI1 Radiant Lab Grown Diamond

ID • E/SI1 • IGI LG850681876

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

Certificate IGI LG850681876

Diamond specifications and retailer prices

From £175 GBP
As of November 6, 2026
Save £459 GBP (72%) vs most expensive(unlock to see where)
7 retailers carry this diamond
Most expensive: £634 GBP at MOH London · As of November 4, 2026
View at MOH London

About this 1.21ct lab-grown radiant diamond

This 1.21ct 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 LG850681876 or 850681876. Listed at 7 retailers as of November 4, 2026, with prices from £175 to £634, a £459 spread on the same certified stone. MOH London lists it at £634. 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

1.21
Carat
E
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle47.2°
Pavilion angle34.9°
OriginLab Grown
Grading LabIGI
CertificateIGI LG850681876
Dimensions7.47 × 5.26 × 3.56 mm
L/W Ratio1.42
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
7.47 mm5.26 mm1.21 ctE / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG850681876
Side View
Table 66.0%Crown 47.2°Girdle: Slightly ThickPavilion 34.9°Culet: NoneDepth 67.7%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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Price History

Last verified: Nov 6
Current: £634 GBP|Low: £123 GBP|High: £634 GBP|Avg: £319 GBP
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 6, 2026
Retailer 5£123 GBP
Retailer 2£175 GBP
Retailer 8£185 GBP
Retailer 7£297 GBP
Retailer 6£326 GBP
Retailer 4£381 GBP
Retailer 3£501 GBP
MOH London£634 GBP

7 data points across 8 retailers

7 retailers£175 GBP to £634 GBP

A
Cheapest Retailer
-
£175 GBP
B+
Retailer 2
-
£185 GBP
View
A
Retailer 3
-
£297 GBP
View
B+
Retailer 4
-
£326 GBP
View
B+
Retailer 5
-
£381 GBP
View
B+
Retailer 6
-
£501 GBP
View
Most Expensive
B
MOH London
LG850681876 · Nov 4
£634 GBP
View
6 more retailers have this diamond
Prices start from £175 GBPSave up to £459 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
1.21ct Radiant
£175 GBP