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Round|Lab Grown|IGI

1.28ct G SI1 Round Lab Grown Diamond

ID • G/SI1 • IGI LG819612892

Shape and cutting style on the report: Round brilliant

Certificate IGI LG819612892

Diamond specifications and retailer prices

From £129 GBP
As of November 5, 2026
Save £614 GBP (83%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: £743 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 G colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG819612892 or 819612892. Listed at 14 retailers as of November 5, 2026, with prices from £129 to £743, a £614 spread on the same certified stone. MOH London lists it at £743. 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
G
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.3°
Pavilion angle41.1°
OriginLab Grown
Grading LabIGI
CertificateIGI LG819612892
Dimensions6.99 × 6.97 × 4.27 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
6.99 mm6.97 mm1.28 ctG / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG819612892
Side View
Table 59.0%Crown 34.3°Girdle: MED-STKPavilion 41.1°Culet: NoneDepth 61.2%

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: £743 GBP|Low: £123 GBP|High: £754 GBP|Avg: £334 GBP|-0.3%
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 6, 2026
Retailer 8£129 GBP
Retailer 10£149 GBP
Retailer 3£159 GBP
Retailer 9£159 GBP
Retailer 5£281 GBP
Retailer 11£284 GBP
Retailer 6£327 GBP
Retailer 2£352 GBP
Retailer 4£402 GBP
Retailer 12£512 GBP
Retailer 7£541 GBP
MOH London£743 GBP

46 data points across 12 retailers

14 retailers£129 GBP to £743 GBP

A
Cheapest Retailer
-
£129 GBP
A
Retailer 2
-
£149 GBP
View
Retailer 3
-
£159 GBP
View
Price last confirmed 12 days ago
A
Retailer 4
-
£159 GBP
View
A
Retailer 5
-
£281 GBP
View
B+
Retailer 6
-
£284 GBP
View
A
Retailer 7
-
£327 GBP
View
B+
Retailer 8
-
£338 GBP
View
A
Retailer 9
-
£352 GBP
View
B+
Retailer 10
-
£402 GBP
View
B
Retailer 11
-
£512 GBP
View
B+
Retailer 12
-
£541 GBP
View
B+
Retailer 13
-
£552 GBP
View
Most Expensive
B
MOH London
LG819612892 · Nov 5
£743 GBP
View
13 more retailers have this diamond
Prices start from £129 GBPSave up to £614 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
£129 GBP