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1.42ct H SI1 Round Lab Grown Diamond

ID • H/SI1 • IGI LG490177009

Shape and cutting style on the report: Round brilliant

Certificate IGI LG490177009

Diamond specifications and retailer prices

From £528 GBP
As of November 5, 2026
Save £2,185 GBP (81%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: £2,713 GBP at MOH London · As of November 3, 2026
View at MOH London

About this 1.42ct lab-grown round diamond

This 1.42ct lab-grown round sits in the one-and-a-quarter to one-and-a-half carat band, graded H colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG490177009 or 490177009. Listed at 11 retailers as of November 3, 2026, with prices from £528 to £2,713, a £2,185 spread on the same certified stone. MOH London lists it at £2,713. 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

1.42
Carat
H
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.4°
Pavilion angle40.2°
OriginLab Grown
Grading LabIGI
CertificateIGI LG490177009
Dimensions7.21 × 7.17 × 4.46 mm
L/W Ratio1.01
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
7.21 mm7.17 mm1.42 ctH / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG490177009
Side View
Table 53.5%Crown 34.4°Girdle: MediumPavilion 40.2°Culet: NoneDepth 62.1%

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: £2,713 GBP|Low: £528 GBP|High: £2,749 GBP|Avg: £1,228 GBP|-1.0%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
November 3, 2026
Retailer 4£528 GBP
Retailer 3£689 GBP
Retailer 7£772 GBP
Retailer 5£799 GBP
Retailer 8£929 GBP
Retailer 9£1,177 GBP
Retailer 6£1,281 GBP
Retailer 2£1,779 GBP
MOH London£2,713 GBP

9 data points across 9 retailers

11 retailers£528 GBP to £2,713 GBP

A
Cheapest Retailer
-
£528 GBP
B+
Retailer 2
-
£689 GBP
View
B+
Retailer 3
-
£750 GBP
View
B+
Retailer 4
-
£772 GBP
View
Final sale: no returns
B+
Retailer 5
-
£799 GBP
View
Retailer 6
-
£799 GBP
View
Price last confirmed 25 days ago
B+
Retailer 7
-
£929 GBP
View
B
Retailer 8
-
£1,281 GBP
View
B
Retailer 9
-
£1,779 GBP
View
B
Retailer 10
-
£2,248 GBP
View
Most Expensive
B
MOH London
LG490177009 · Nov 3
£2,713 GBP
View
10 more retailers have this diamond
Prices start from £528 GBPSave up to £2,185 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
1.42ct Round
£528 GBP