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Round|Lab Grown|IGI

0.42ct F SI1 Round Lab Grown Diamond

VG • F/SI1 • IGI LG459129634

Shape and cutting style on the report: Round brilliant

Certificate IGI LG459129634

Diamond specifications and retailer prices

From £192 GBP
As of November 5, 2026
Save £762 GBP (80%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: £954 GBP at MOH London · As of November 5, 2026
View at MOH London

About this 0.42ct lab-grown round diamond

This 0.42ct lab-grown round sits in the sub-half-carat band, graded F colour (colourless) and SI1 clarity (slightly-included), with a very-good cut grade and certified by IGI LG459129634 or 459129634. Listed at 10 retailers as of November 5, 2026, with prices from £192 to £954, a £762 spread on the same certified stone. MOH London lists it at £954. Cut grade matters more than carat or clarity for visible brilliance. If you can shift budget toward an Excellent or Ideal cut, do it before chasing higher colour or clarity.

The 4Cs

0.42
Carat
F
Colour
SI1
Clarity
Very Good
Cut

Specifications

CutVery Good
PolishExcellent
SymmetryVery Good
FluorescenceNone
Crown angle37.4°
Pavilion angle40.2°
OriginLab Grown
Grading LabIGI
CertificateIGI LG459129634
Dimensions4.77 × 4.79 × 2.96 mm
L/W Ratio1.00
Girdle conditionFaceted
Culet sizePointed
Cert comments
As Grown - No indication of post-growth treatment This Laboratory Grown Diamond was created by High Pressure High Temperature (HPHT) growth process Type II
Top View
4.77 mm4.79 mm0.42 ctF / SI1
OriginLab Grown
CutVery Good
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateIGI LG459129634
Side View
Table 57.5%Crown 37.4°Girdle: MED-STKPavilion 40.2°Culet: NoneDepth 62.0%

Caratlytics Score

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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: £954 GBP|Low: £185 GBP|High: £968 GBP|Avg: £393 GBP|-0.3%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 6, 2026
Retailer 5£192 GBP
Retailer 3£201 GBP
Retailer 8£223 GBP
Retailer 6£238 GBP
Retailer 7£397 GBP
Retailer 2£447 GBP
Retailer 4£450 GBP
MOH London£954 GBP

45 data points across 8 retailers

10 retailers£192 GBP to £954 GBP

A
Cheapest Retailer
-
£192 GBP
A
Retailer 2
-
£201 GBP
View
B+
Retailer 3
-
£223 GBP
View
B+
Retailer 4
-
£238 GBP
View
Retailer 5
-
£238 GBP
View
Price last confirmed 12 days ago
B
Retailer 6
-
£397 GBP
View
B
Retailer 7
-
£447 GBP
View
Retailer 8
-
£450 GBP
View
Price last confirmed 8 days ago
B
Retailer 9
-
£768 GBP
View
Most Expensive
B
MOH London
LG459129634 · Nov 5
£954 GBP
View
9 more retailers have this diamond
Prices start from £192 GBPSave up to £762 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
0.42ct Round
£192 GBP