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1.31ct I SI1 Round Lab Grown Diamond

ID • I/SI1 • IGI LG459130921

Shape and cutting style on the report: Round brilliant

Certificate IGI LG459130921

Diamond specifications and retailer prices

From £552 GBP
$740 USD
As of October 30, 2026
Save £1,917 GBP (78%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: £2,469 GBP at MOH London · As of October 26, 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 I colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG459130921 or 459130921. Listed at 11 retailers as of October 26, 2026, with prices from £552 to £2,469, a £1,917 spread on the same certified stone. MOH London lists it at £2,469. 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
I
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33.5°
Pavilion angle40.5°
OriginLab Grown
Grading LabIGI
CertificateIGI LG459130921
Dimensions7.07 × 7.10 × 4.25 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
7.07 mm7.10 mm1.31 ctI / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG459130921
Side View
Table 59.5%Crown 33.5°GirdlePavilion 40.5°Culet: NoneDepth 59.9%

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: Oct 30
Current: £2,469 GBP|Low: £544 GBP|High: £2,499 GBP|Avg: £1,005 GBP|+0.1%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
October 30, 2026
Retailer 2£552 GBP
Retailer 4£567 GBP
Retailer 8£634 GBP
Retailer 6£658 GBP
Retailer 9£658 GBP
Retailer 5£791 GBP
Retailer 10£1,032 GBP
Retailer 7£1,064 GBP
Retailer 3£1,564 GBP
MOH London£2,469 GBP

16 data points across 10 retailers

11 retailers£552 GBP to £2,469 GBP

A
Cheapest Retailer
-
£552 GBP
$740 USD
A
Retailer 2
-
£567 GBP
$760 USD
View
B+
Retailer 3
-
£617 GBP
$827 USD
View
B+
Retailer 4
-
£634 GBP
$850 USD
View
Final sale: no returns
B+
Retailer 5
-
£658 GBP
$881 USD
View
Retailer 6
-
£658 GBP
$881 USD
View
Price last confirmed 19 days ago
B+
Retailer 7
-
£791 GBP
$1,060 USD
View
B
Retailer 8
-
£1,064 GBP
$1,426 USD
View
B
Retailer 9
-
£1,564 GBP
$2,096 USD
View
B
Retailer 10
-
£1,849 GBP
$2,478 USD
View
Most Expensive
B
MOH London
LG459130921 · Oct 26
£2,469 GBP
View
10 more retailers have this diamond
Prices start from £552 GBPSave up to £1,917 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
£552 GBP