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Round|Lab Grown|IGI

1.31ct J SI1 Round Lab Grown Diamond

ID • J/SI1 • IGI LG436072947

Shape and cutting style on the report: Round brilliant

Certificate IGI LG436072947

Diamond specifications and retailer prices

From £461 GBP
As of November 5, 2026
Save £1,794 GBP (80%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: £2,255 GBP at MOH London · As of November 3, 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 SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG436072947 or 436072947. Listed at 12 retailers as of November 3, 2026, with prices from £461 to £2,255, a £1,794 spread on the same certified stone. MOH London lists it at £2,255. 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
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.3°
Pavilion angle40.2°
OriginLab Grown
Grading LabIGI
CertificateIGI LG436072947
Dimensions7.13 × 7.10 × 4.22 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
7.13 mm7.10 mm1.31 ctJ / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG436072947
Side View
Table 59.5%Crown 34.3°GirdlePavilion 40.2°Culet: NoneDepth 59.4%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 5
Current: £2,255 GBP|Low: £369 GBP|High: £2,283 GBP|Avg: £872 GBP
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 1, 2026
Retailer 6£461 GBP
Retailer 9£517 GBP
Retailer 2£557 GBP
Retailer 7£572 GBP
Retailer 10£572 GBP
Retailer 11£579 GBP
Retailer 5£669 GBP
Retailer 8£876 GBP
Retailer 3£903 GBP
Retailer 4£1,421 GBP
MOH London£2,255 GBP

17 data points across 11 retailers

12 retailers£461 GBP to £2,255 GBP

A
Cheapest Retailer
-
£461 GBP
B+
Retailer 2
-
£517 GBP
View
Final sale: no returns
B+
Retailer 3
-
£517 GBP
View
B+
Retailer 4
-
£557 GBP
View
B+
Retailer 5
-
£572 GBP
View
Retailer 6
-
£572 GBP
View
Price last confirmed 21 days ago
B+
Retailer 7
-
£579 GBP
View
B+
Retailer 8
-
£669 GBP
View
B
Retailer 9
-
£876 GBP
View
B
Retailer 10
-
£1,421 GBP
View
B
Retailer 11
-
£1,505 GBP
View
Most Expensive
B
MOH London
LG436072947 · Nov 3
£2,255 GBP
View
11 more retailers have this diamond
Prices start from £461 GBPSave up to £1,794 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
£461 GBP