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Round|Lab Grown|IGI

1.31ct J SI2 Round Lab Grown Diamond

ID • J/SI2 • IGI LG407930537

Shape and cutting style on the report: Round brilliant

Certificate IGI LG407930537

Diamond specifications and retailer prices

From £432 GBP
As of November 5, 2026
Save £1,889 GBP (81%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: £2,321 GBP at MOH London · As of November 5, 2026
View at MOH London

About this 1.31ct lab-grown round diamond

This 1.31ct lab-grown round sits in the one-and-a-quarter to one-and-a-half carat band, graded J colour (near-colourless) and SI2 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG407930537 or 407930537. Listed at 10 retailers as of November 5, 2026, with prices from £432 to £2,321, a £1,889 spread on the same certified stone. MOH London lists it at £2,321. 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

1.31
Carat
J
Colour
SI2
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36°
Pavilion angle40.2°
OriginLab Grown
Grading LabIGI
CertificateIGI LG407930537
Dimensions7.08 × 7.05 × 4.31 mm
L/W Ratio1.00
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory grown diamond was created by chemical vapor deposition process (CVD) Type IIa
Top View
7.08 mm7.05 mm1.31 ctJ / SI2
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG407930537
Side View
Table 55.5%Crown 36°Girdle: MediumPavilion 40.2°Culet: NoneDepth 61.0%

Caratlytics Score

How it works →
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: £2,321 GBP|Low: £415 GBP|High: £2,356 GBP|Avg: £950 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
November 5, 2026
Retailer 5£432 GBP
Retailer 10£484 GBP
Retailer 8£484 GBP
Retailer 6£536 GBP
Retailer 2£550 GBP
Retailer 7£825 GBP
Retailer 11£859 GBP
Retailer 3£1,121 GBP
Retailer 4£1,331 GBP
Retailer 9£1,410 GBP
MOH London£2,321 GBP

15 data points across 11 retailers

10 retailers£432 GBP to £2,321 GBP

A
Cheapest Retailer
-
£432 GBP
A
Retailer 2
-
£484 GBP
View
Final sale: no returns
A
Retailer 3
-
£484 GBP
View
B+
Retailer 4
-
£536 GBP
View
Retailer 5
-
£536 GBP
View
Price last confirmed 21 days ago
B+
Retailer 6
-
£550 GBP
View
B
Retailer 7
-
£825 GBP
View
B
Retailer 8
-
£1,331 GBP
View
B
Retailer 9
-
£1,410 GBP
View
Most Expensive
B
MOH London
LG407930537 · Nov 5
£2,321 GBP
View
9 more retailers have this diamond
Prices start from £432 GBPSave up to £1,889 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
1.31ct Round
£432 GBP