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Round|Lab Grown|IGI

0.42ct F SI2 Round Lab Grown Diamond

VG • F/SI2 • IGI LG407901862

Shape and cutting style on the report: Round brilliant

Certificate IGI LG407901862

Diamond specifications and retailer prices

From £162 GBP
As of November 5, 2026
Save £642 GBP (80%) vs most expensive(unlock to see where)
9 retailers carry this diamond
Most expensive: £804 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 SI2 clarity (slightly-included), with a very-good cut grade and certified by IGI LG407901862 or 407901862. Listed at 9 retailers as of November 5, 2026, with prices from £162 to £804, a £642 spread on the same certified stone. MOH London lists it at £804. 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
SI2
Clarity
Very Good
Cut

Specifications

CutVery Good
PolishExcellent
SymmetryVery Good
FluorescenceNone
Crown angle37°
Pavilion angle41.2°
OriginLab Grown
Grading LabIGI
CertificateIGI LG407901862
Dimensions4.72 × 4.76 × 2.99 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory grown diamond was created by high pressure high temperature process (HPHT) Type II
Top View
4.72 mm4.76 mm0.42 ctF / SI2
OriginLab Grown
CutVery Good
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateIGI LG407901862
Side View
Table 59.5%Crown 37°Girdle: MED-STKPavilion 41.2°Culet: NoneDepth 63.1%

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: £804 GBP|Low: £156 GBP|High: £815 GBP|Avg: £364 GBP|-0.2%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
November 6, 2026
Retailer 4£162 GBP
Retailer 3£186 GBP
Retailer 7£188 GBP
Retailer 5£201 GBP
Retailer 6£345 GBP
Retailer 2£389 GBP
Retailer 8£415 GBP
Retailer 10£421 GBP
Retailer 9£462 GBP
MOH London£804 GBP

22 data points across 10 retailers

9 retailers£162 GBP to £804 GBP

A
Cheapest Retailer
-
£162 GBP
B+
Retailer 2
-
£186 GBP
View
B+
Retailer 3
-
£188 GBP
View
Retailer 4
-
£201 GBP
View
Price last confirmed 12 days ago
B+
Retailer 5
-
£201 GBP
View
B
Retailer 6
-
£345 GBP
View
B
Retailer 7
-
£389 GBP
View
B
Retailer 8
-
£646 GBP
View
Most Expensive
B
MOH London
LG407901862 · Nov 5
£804 GBP
View
8 more retailers have this diamond
Prices start from £162 GBPSave up to £642 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
£162 GBP