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Round|Lab Grown|IGI

1.31ct I SI1 Round Lab Grown Diamond

EX • I/SI1 • IGI LG451055654

Shape and cutting style on the report: Round brilliant

Certificate IGI LG451055654

Diamond specifications and retailer prices

From £560 GBP
$750 USD
As of October 30, 2026
Save £1,909 GBP (77%) 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 LG451055654 or 451055654. Listed at 11 retailers as of October 26, 2026, with prices from £560 to £2,469, a £1,909 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
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle32.2°
Pavilion angle41.1°
OriginLab Grown
Grading LabIGI
CertificateIGI LG451055654
Dimensions7.11 × 7.14 × 4.32 mm
L/W Ratio1.00
Girdle conditionFaceted
Culet sizePointed
Cert comments
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Top View
7.11 mm7.14 mm1.31 ctI / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG451055654
Side View
Table 56.0%Crown 32.2°Girdle: THN-MEDPavilion 41.1°Culet: NoneDepth 60.8%

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: £2,496 GBP|Avg: £1,092 GBP|-0.9%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
October 30, 2026
Retailer 2£560 GBP
Retailer 5£567 GBP
Retailer 9£634 GBP
Retailer 6£658 GBP
Retailer 10£658 GBP
Retailer 8£791 GBP
Retailer 11£1,032 GBP
Retailer 7£1,064 GBP
Retailer 4£1,564 GBP
Retailer 3£1,882 GBP
MOH London£2,469 GBP

15 data points across 11 retailers

11 retailers£560 GBP to £2,469 GBP

A
Cheapest Retailer
-
£560 GBP
$750 USD
A
Retailer 2
-
£567 GBP
$760 USD
View
A
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
LG451055654 · Oct 26
£2,469 GBP
View
10 more retailers have this diamond
Prices start from £560 GBPSave up to £1,909 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
£560 GBP