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Round|Lab Grown|IGI

1.21ct E SI2 Round Lab Grown Diamond

ID • E/SI2 • IGI LG766645929

Shape and cutting style on the report: Round brilliant

Certificate IGI LG766645929

Diamond specifications and retailer prices

From £120 GBP
As of November 1, 2026
Save £579 GBP (83%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: £699 GBP at MOH London · As of November 2, 2026
View at MOH London

About this 1.21ct lab-grown round diamond

This 1.21ct lab-grown round sits in the classic one-carat band, graded E colour (colourless) and SI2 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG766645929 or 766645929. Listed at 15 retailers as of November 1, 2026, with prices from £120 to £699, a £579 spread on the same certified stone. MOH London lists it at £699. 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
SI2
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishVery Good
SymmetryExcellent
FluorescenceNone
Crown angle34.6°
Pavilion angle40.1°
OriginLab Grown
Grading LabIGI
CertificateIGI LG766645929
Dimensions6.89 × 6.85 × 4.14 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
6.89 mm6.85 mm1.21 ctE / SI2
OriginLab Grown
CutIdeal
PolishVery Good
SymmetryExcellent
FluorescenceNone
CertificateIGI LG766645929
Side View
Table 57.0%Crown 34.6°Girdle: MediumPavilion 40.1°Culet: NoneDepth 60.3%

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 1
Current: £699 GBP|Low: £116 GBP|High: £719 GBP|Avg: £312 GBP|-2.8%
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
November 4, 2026
Retailer 12£120 GBP
Retailer 13£135 GBP
Retailer 6£147 GBP
Retailer 5£149 GBP
Retailer 7£258 GBP
Retailer 10£261 GBP
Retailer 3£270 GBP
Retailer 2£316 GBP
Retailer 14£335 GBP
Retailer 4£339 GBP
Retailer 9£345 GBP
Retailer 8£388 GBP
Retailer 11£416 GBP
MOH London£699 GBP

36 data points across 14 retailers

15 retailers£120 GBP to £699 GBP

A
Cheapest Retailer
-
£120 GBP
A
Retailer 2
-
£135 GBP
View
Final sale: no returns
Retailer 3
-
£147 GBP
View
Price last confirmed 52 days ago
Retailer 4
-
£149 GBP
View
Price last confirmed 12 days ago
A
Retailer 5
-
£258 GBP
View
A
Retailer 6
-
£261 GBP
View
B+
Retailer 7
-
£270 GBP
View
B+
Retailer 8
-
£312 GBP
View
B+
Retailer 9
-
£316 GBP
View
B+
Retailer 10
-
£335 GBP
View
B+
Retailer 11
-
£339 GBP
View
B+
Retailer 12
-
£345 GBP
View
B
Retailer 13
-
£388 GBP
View
B+
Retailer 14
-
£416 GBP
View
Most Expensive
B
MOH London
LG766645929 · Nov 2
£699 GBP
View
14 more retailers have this diamond
Prices start from £120 GBPSave up to £579 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 Round
£120 GBP