CaratHunter
Plans
Round|Lab Grown|IGI

1.28ct E SI1 Round Lab Grown Diamond

ID • E/SI1 • IGI LG792617959

Shape and cutting style on the report: Round brilliant

Certificate IGI LG792617959

Diamond specifications and retailer prices

From £246 GBP
As of November 5, 2026
Save £676 GBP (73%) vs most expensive(unlock to see where)
8 retailers carry this diamond
Most expensive: £922 GBP at MOH London · As of November 5, 2026
View at MOH London

About this 1.28ct lab-grown round diamond

This 1.28ct 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 LG792617959 or 792617959. Listed at 8 retailers as of November 5, 2026, with prices from £246 to £922, a £676 spread on the same certified stone. MOH London lists it at £922. 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

1.28
Carat
E
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.8°
Pavilion angle41°
OriginLab Grown
Grading LabIGI
CertificateIGI LG792617959
Dimensions6.97 × 7.00 × 4.26 mm
L/W Ratio1.00
Girdle conditionFaceted
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
6.97 mm7.00 mm1.28 ctE / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG792617959
Side View
Table 60.0%Crown 34.8°Girdle: MediumPavilion 41°Culet: NoneDepth 60.9%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 5
Current: £922 GBP|Low: £236 GBP|High: £928 GBP|Avg: £492 GBP|+14.7%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 6, 2026
Retailer 3£246 GBP
Retailer 4£342 GBP
Retailer 7£354 GBP
Retailer 2£433 GBP
Retailer 5£446 GBP
Retailer 8£616 GBP
Retailer 6£868 GBP
MOH London£922 GBP

32 data points across 8 retailers

8 retailers£246 GBP to £922 GBP

A
Cheapest Retailer
-
£246 GBP
B+
Retailer 2
-
£342 GBP
View
B+
Retailer 3
-
£354 GBP
View
B
Retailer 4
-
£433 GBP
View
B
Retailer 5
-
£446 GBP
View
B
Retailer 6
-
£616 GBP
View
B
Retailer 7
-
£868 GBP
View
Most Expensive
B
MOH London
LG792617959 · Nov 5
£922 GBP
View
7 more retailers have this diamond
Prices start from £246 GBPSave up to £676 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
1.28ct Round
£246 GBP