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Round|Lab Grown|IGI

1.09ct G SI1 Round Lab Grown Diamond

ID • G/SI1 • IGI LG804642958

Shape and cutting style on the report: Round brilliant

Certificate IGI LG804642958

Diamond specifications and retailer prices

From £106 GBP
As of November 5, 2026
Save £509 GBP (83%) vs most expensive(unlock to see where)
18 retailers carry this diamond
Most expensive: £615 GBP at MOH London · As of November 4, 2026
View at MOH London

About this 1.09ct lab-grown round diamond

This 1.09ct lab-grown round sits in the classic one-carat band, graded G colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG804642958 or 804642958. Listed at 18 retailers as of November 4, 2026, with prices from £106 to £615, a £509 spread on the same certified stone. MOH London lists it at £615. 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

1.09
Carat
G
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.4°
Pavilion angle40.7°
OriginLab Grown
Grading LabIGI
CertificateIGI LG804642958
Dimensions6.67 × 6.60 × 4.03 mm
L/W Ratio1.01
Girdle conditionFaceted
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
6.67 mm6.60 mm1.09 ctG / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG804642958
Side View
Table 60.0%Crown 34.4°Girdle: MED-STKPavilion 40.7°Culet: NoneDepth 60.7%

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: £615 GBP|Low: £106 GBP|High: £667 GBP|Avg: £295 GBP|-7.5%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
Retailer 14
November 6, 2026
Retailer 12£106 GBP
Retailer 11£123 GBP
Retailer 6£132 GBP
Retailer 7£224 GBP
Retailer 10£230 GBP
Retailer 3£246 GBP
Retailer 14£253 GBP
Retailer 2£292 GBP
Retailer 8£312 GBP
Retailer 13£317 GBP
Retailer 5£424 GBP
Retailer 9£448 GBP
Retailer 4£465 GBP
MOH London£615 GBP

37 data points across 14 retailers

18 retailers£106 GBP to £615 GBP

A
Cheapest Retailer
-
£106 GBP
A
Retailer 2
-
£123 GBP
View
A
Retailer 3
-
£132 GBP
View
Retailer 4
-
£141 GBP
View
Price last confirmed 12 days ago
A
Retailer 5
-
£224 GBP
View
A
Retailer 6
-
£230 GBP
View
A
Retailer 7
-
£246 GBP
View
B+
Retailer 8
-
£253 GBP
View
B+
Retailer 9
-
£292 GBP
View
B+
Retailer 10
-
£312 GBP
View
B+
Retailer 11
-
£312 GBP
View
B+
Retailer 12
-
£317 GBP
View
Retailer 13
-
£323 GBP
View
Price last confirmed 95 days ago
B+
Retailer 14
-
£337 GBP
View
B
Retailer 15
-
£424 GBP
View
B
Retailer 16
-
£448 GBP
View
B
Retailer 17
-
£465 GBP
View
Most Expensive
B
MOH London
LG804642958 · Nov 4
£615 GBP
View
17 more retailers have this diamond
Prices start from £106 GBPSave up to £509 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
1.09ct Round
£106 GBP