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Round|Lab Grown|IGI

1.25ct E SI1 Round Lab Grown Diamond

EX • E/SI1 • IGI LG776601800

Shape and cutting style on the report: Round brilliant

Certificate IGI LG776601800

Diamond specifications and retailer prices

From £306 GBP
As of November 5, 2026
Save £511 GBP (63%) vs most expensive(unlock to see where)
6 retailers carry this diamond
Most expensive: £817 GBP at MOH London · As of November 2, 2026
View at MOH London

About this 1.25ct lab-grown round diamond

This 1.25ct 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 LG776601800 or 776601800. Listed at 6 retailers as of November 2, 2026, with prices from £306 to £817, a £511 spread on the same certified stone. MOH London lists it at £817. 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

1.25
Carat
E
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33.9°
Pavilion angle41.2°
OriginLab Grown
Grading LabIGI
CertificateIGI LG776601800
Dimensions6.93 × 6.91 × 4.23 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
6.93 mm6.91 mm1.25 ctE / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG776601800
Side View
Table 61.0%Crown 33.9°Girdle: MED-STKPavilion 41.2°Culet: NoneDepth 61.1%

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: Nov 5
Current: £817 GBP|Low: £269 GBP|High: £827 GBP|Avg: £424 GBP|+2.1%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
November 4, 2026
Retailer 5£306 GBP
Retailer 4£331 GBP
Retailer 2£348 GBP
Retailer 3£374 GBP
Retailer 6£440 GBP
MOH London£817 GBP

39 data points across 6 retailers

6 retailers£306 GBP to £817 GBP

A
Cheapest Retailer
-
£306 GBP
B+
Retailer 2
-
£331 GBP
View
B+
Retailer 3
-
£348 GBP
View
B+
Retailer 4
-
£374 GBP
View
B
Retailer 5
-
£440 GBP
View
Most Expensive
B
MOH London
LG776601800 · Nov 2
£817 GBP
View
5 more retailers have this diamond
Prices start from £306 GBPSave up to £511 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
1.25ct Round
£306 GBP