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1.26ct J SI1 Round Lab Grown Diamond

EX • J/SI1 • IGI LG451057956

Shape and cutting style on the report: Round brilliant

Certificate IGI LG451057956

Diamond specifications and retailer prices

From £445 GBP
As of November 5, 2026
Save £1,950 GBP (81%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: £2,395 GBP at MOH London · As of November 1, 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 J colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG451057956 or 451057956. Listed at 11 retailers as of November 1, 2026, with prices from £445 to £2,395, a £1,950 spread on the same certified stone. MOH London lists it at £2,395. 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
J
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle31.5°
Pavilion angle40.3°
OriginLab Grown
Grading LabIGI
CertificateIGI LG451057956
Dimensions7.16 × 7.05 × 4.17 mm
L/W Ratio1.02
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) process Type IIa
Top View
7.16 mm7.05 mm1.26 ctJ / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG451057956
Side View
Table 57.0%Crown 31.5°Girdle: MediumPavilion 40.3°Culet: NoneDepth 59.1%

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 5
Current: £2,395 GBP|Low: £427 GBP|High: £2,423 GBP|Avg: £945 GBP
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 1, 2026
Retailer 6£445 GBP
Retailer 9£497 GBP
Retailer 2£535 GBP
Retailer 7£551 GBP
Retailer 10£551 GBP
Retailer 4£646 GBP
Retailer 8£846 GBP
Retailer 11£876 GBP
Retailer 5£1,369 GBP
Retailer 3£1,476 GBP
MOH London£2,395 GBP

19 data points across 11 retailers

11 retailers£445 GBP to £2,395 GBP

A
Cheapest Retailer
-
£445 GBP
B+
Retailer 2
-
£497 GBP
View
Final sale: no returns
B+
Retailer 3
-
£498 GBP
View
B+
Retailer 4
-
£535 GBP
View
Retailer 5
-
£551 GBP
View
Price last confirmed 21 days ago
B+
Retailer 6
-
£551 GBP
View
B+
Retailer 7
-
£646 GBP
View
B
Retailer 8
-
£846 GBP
View
B
Retailer 9
-
£1,369 GBP
View
B
Retailer 10
-
£1,450 GBP
View
Most Expensive
B
MOH London
LG451057956 · Nov 1
£2,395 GBP
View
10 more retailers have this diamond
Prices start from £445 GBPSave up to £1,950 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
£445 GBP