CaratHunter
Plans
Round|Lab Grown|IGI

1.40ct J SI1 Round Lab Grown Diamond

EX • J/SI1 • IGI LG451057955

Shape and cutting style on the report: Round brilliant

Certificate IGI LG451057955

Diamond specifications and retailer prices

From £492 GBP
As of November 5, 2026
Save £1,905 GBP (79%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: £2,397 GBP at MOH London · As of November 5, 2026
View at MOH London

About this 1.4ct lab-grown round diamond

This 1.4ct 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 LG451057955 or 451057955. Listed at 11 retailers as of November 5, 2026, with prices from £492 to £2,397, a £1,905 spread on the same certified stone. MOH London lists it at £2,397. 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

1.40
Carat
J
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle32.2°
Pavilion angle40.1°
OriginLab Grown
Grading LabIGI
CertificateIGI LG451057955
Dimensions7.30 × 7.28 × 4.24 mm
L/W Ratio1.00
Girdle conditionFaceted
Culet sizePointed
Cert comments
undefined
Top View
7.30 mm7.28 mm1.40 ctJ / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG451057955
Side View
Table 62.0%Crown 32.2°Girdle: MED-STKPavilion 40.1°Culet: NoneDepth 58.1%

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: £2,397 GBP|Low: £473 GBP|High: £2,433 GBP|Avg: £1,048 GBP|-1.4%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
November 5, 2026
Retailer 5£492 GBP
Retailer 8£551 GBP
Retailer 6£571 GBP
Retailer 2£594 GBP
Retailer 4£702 GBP
Retailer 9£924 GBP
Retailer 7£931 GBP
Retailer 3£1,458 GBP
Retailer 10£1,633 GBP
MOH London£2,397 GBP

15 data points across 10 retailers

11 retailers£492 GBP to £2,397 GBP

A
Cheapest Retailer
-
£492 GBP
A
Retailer 2
-
£535 GBP
View
B+
Retailer 3
-
£551 GBP
View
Final sale: no returns
Retailer 4
-
£571 GBP
View
Price last confirmed 21 days ago
B+
Retailer 5
-
£571 GBP
View
B+
Retailer 6
-
£594 GBP
View
B+
Retailer 7
-
£702 GBP
View
B
Retailer 8
-
£931 GBP
View
B
Retailer 9
-
£1,458 GBP
View
B
Retailer 10
-
£1,604 GBP
View
Most Expensive
B
MOH London
LG451057955 · Nov 5
£2,397 GBP
View
10 more retailers have this diamond
Prices start from £492 GBPSave up to £1,905 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
1.40ct Round
£492 GBP