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Round|Lab Grown|IGI

1.20ct H SI1 Round Lab Grown Diamond

ID • H/SI1 • IGI LG811647134

Shape and cutting style on the report: Round brilliant

Certificate IGI LG811647134

Diamond specifications and retailer prices

From £142 GBP
As of November 5, 2026
Save £679 GBP (83%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: £821 GBP at MOH London · As of November 5, 2026
View at MOH London

About this 1.2ct lab-grown round diamond

This 1.2ct lab-grown round sits in the classic one-carat band, graded H colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG811647134 or 811647134. Listed at 15 retailers as of November 5, 2026, with prices from £142 to £821, a £679 spread on the same certified stone. MOH London lists it at £821. 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

1.20
Carat
H
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.3°
Pavilion angle40.2°
OriginLab Grown
Grading LabIGI
CertificateIGI LG811647134
Dimensions6.84 × 6.82 × 4.15 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
6.84 mm6.82 mm1.20 ctH / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG811647134
Side View
Table 58.0%Crown 34.3°Girdle: MED-STKPavilion 40.2°Culet: NoneDepth 60.7%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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Price History

Last verified: Nov 5
Current: £821 GBP|Low: £142 GBP|High: £833 GBP|Avg: £388 GBP|-0.2%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 6, 2026
Retailer 8£142 GBP
Retailer 9£176 GBP
Retailer 2£273 GBP
Retailer 11£291 GBP
Retailer 10£308 GBP
Retailer 4£322 GBP
Retailer 6£327 GBP
Retailer 5£401 GBP
Retailer 7£568 GBP
Retailer 3£606 GBP
MOH London£821 GBP

33 data points across 11 retailers

15 retailers£142 GBP to £821 GBP

A
Cheapest Retailer
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£142 GBP
A
Retailer 2
-
£165 GBP
View
Retailer 3
-
£176 GBP
View
Price last confirmed 12 days ago
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Retailer 4
-
£176 GBP
View
A
Retailer 5
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£273 GBP
View
A
Retailer 6
-
£291 GBP
View
A
Retailer 7
-
£308 GBP
View
A
Retailer 8
-
£322 GBP
View
A
Retailer 9
-
£327 GBP
View
A
Retailer 10
-
£401 GBP
View
A
Retailer 11
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£455 GBP
View
A
Retailer 12
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£566 GBP
View
A
Retailer 13
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£568 GBP
View
A
Retailer 14
-
£606 GBP
View
Most Expensive
A
MOH London
LG811647134 · Nov 5
£821 GBP
View
14 more retailers have this diamond
Prices start from £142 GBPSave up to £679 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
1.20ct Round
£142 GBP