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1.26ct E SI1 Round Lab Grown Diamond

EX • E/SI1 • IGI LG758581221

Shape and cutting style on the report: Round brilliant

Certificate IGI LG758581221

Diamond specifications and retailer prices

From £122 GBP
As of November 1, 2026
Save £585 GBP (83%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: £707 GBP at MOH London · As of November 2, 2026
View at MOH London

About this 1.26ct lab-grown round diamond

This 1.26ct lab-grown round sits in the one-and-a-quarter to one-and-a-half carat band, graded E colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG758581221 or 758581221. Listed at 11 retailers as of November 1, 2026, with prices from £122 to £707, a £585 spread on the same certified stone. MOH London lists it at £707. 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

1.26
Carat
E
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.5°
Pavilion angle41°
OriginLab Grown
Grading LabIGI
CertificateIGI LG758581221
Dimensions6.87 × 6.84 × 4.30 mm
L/W Ratio1.00
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
6.87 mm6.84 mm1.26 ctE / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG758581221
Side View
Table 57.0%Crown 35.5°Girdle: MED-STKPavilion 41°Culet: NoneDepth 62.8%

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: £707 GBP|Low: £121 GBP|High: £740 GBP|Avg: £308 GBP|-4.2%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
November 2, 2026
Retailer 7£122 GBP
Retailer 8£137 GBP
Retailer 12£156 GBP
Retailer 2£260 GBP
Retailer 5£265 GBP
Retailer 11£272 GBP
Retailer 10£295 GBP
Retailer 9£338 GBP
Retailer 4£353 GBP
Retailer 6£389 GBP
Retailer 3£438 GBP
MOH London£707 GBP

34 data points across 12 retailers

11 retailers£122 GBP to £707 GBP

A
Cheapest Retailer
-
£122 GBP
Retailer 2
-
£156 GBP
View
Price last confirmed 12 days ago
A
Retailer 3
-
£260 GBP
View
A
Retailer 4
-
£265 GBP
View
B+
Retailer 5
-
£272 GBP
View
A
Retailer 6
-
£295 GBP
View
B+
Retailer 7
-
£338 GBP
View
Retailer 8
-
£353 GBP
View
Price last confirmed 40 days ago
B+
Retailer 9
-
£389 GBP
View
B
Retailer 10
-
£438 GBP
View
Most Expensive
B
MOH London
LG758581221 · Nov 2
£707 GBP
View
10 more retailers have this diamond
Prices start from £122 GBPSave up to £585 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
1.26ct Round
£122 GBP