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Round|Lab Grown|IGI

1.09ct J SI1 Round Lab Grown Diamond

ID • J/SI1 • IGI LG436073891

Shape and cutting style on the report: Round brilliant

Certificate IGI LG436073891

Diamond specifications and retailer prices

From £363 GBP
As of November 5, 2026
Save £1,512 GBP (81%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: £1,875 GBP at MOH London · As of November 5, 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 J colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG436073891 or 436073891. Listed at 13 retailers as of November 5, 2026, with prices from £363 to £1,875, a £1,512 spread on the same certified stone. MOH London lists it at £1,875. 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
J
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33°
Pavilion angle40.5°
OriginLab Grown
Grading LabIGI
CertificateIGI LG436073891
Dimensions6.67 × 6.64 × 4.04 mm
L/W Ratio1.00
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process and may include post-growth treatment Type IIa
Top View
6.67 mm6.64 mm1.09 ctJ / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG436073891
Side View
Table 56.5%Crown 33°GirdlePavilion 40.5°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: £1,875 GBP|Low: £291 GBP|High: £1,902 GBP|Avg: £702 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
Retailer 13
Retailer 14
November 5, 2026
Retailer 10£363 GBP
Retailer 3£406 GBP
Retailer 14£406 GBP
Retailer 5£419 GBP
Retailer 11£450 GBP
Retailer 13£450 GBP
Retailer 7£461 GBP
Retailer 2£483 GBP
Retailer 9£554 GBP
Retailer 12£701 GBP
Retailer 6£769 GBP
Retailer 4£1,184 GBP
Retailer 8£1,210 GBP
MOH London£1,875 GBP

39 data points across 14 retailers

13 retailers£363 GBP to £1,875 GBP

A
Cheapest Retailer
-
£363 GBP
A
Retailer 2
-
£406 GBP
View
A
Retailer 3
-
£406 GBP
View
Final sale: no returns
A
Retailer 4
-
£419 GBP
View
Retailer 5
-
£450 GBP
View
Price last confirmed 21 days ago
A
Retailer 6
-
£450 GBP
View
A
Retailer 7
-
£461 GBP
View
A
Retailer 8
-
£483 GBP
View
A
Retailer 9
-
£554 GBP
View
B+
Retailer 10
-
£701 GBP
View
B
Retailer 11
-
£1,184 GBP
View
B
Retailer 12
-
£1,210 GBP
View
Most Expensive
B
MOH London
LG436073891 · Nov 5
£1,875 GBP
View
12 more retailers have this diamond
Prices start from £363 GBPSave up to £1,512 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
£363 GBP