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Round|Lab Grown|IGI

0.42ct J IF Round Lab Grown Diamond

VG • J/IF • IGI LGF6G39218

Certificate IGI LGF6G39218

Diamond specifications and retailer prices

From £354 GBP
As of October 31, 2026
Save £242 GBP (41%) vs most expensive(unlock to see where)
2 retailers carry this diamond
Most expensive: £596 GBP at 18carati · As of October 31, 2026
View at 18carati

About this 0.42ct lab-grown round diamond

This 0.42ct lab-grown round sits in the sub-half-carat band, graded J colour (near-colourless) and IF clarity (flawless or internally-flawless), with a very-good cut grade and certified by IGI LGF6G39218 or F6G39218. Listed at 2 retailers as of October 31, 2026, with prices from £354 to £596, a £242 spread on the same certified stone. 18carati lists it at £596. 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
J
Colour
IF
Clarity
Very Good
Cut

Specifications

CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginLab Grown
Grading LabIGI
CertificateIGI LGF6G39218
Dimensions4.78 × 4.80 × 3.00 mm
L/W Ratio1.00
Top View
4.78 mm4.80 mm0.42 ctJ / IF
OriginLab Grown
CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LGF6G39218
Side View
Table 54.5%CrownGirdlePavilionCulet: NoneDepth 62.6%

Caratlytics Score

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B
Good
Decent quality, room for better deals
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Price History

Last verified: Oct 31
Current: £596 GBP|Low: £338 GBP|High: £596 GBP|Avg: £469 GBP|+4.1%
18carati
Retailer 2
October 31, 2026
Retailer 2£354 GBP
18carati£596 GBP

30 data points across 2 retailers

2 retailers£354 GBP to £596 GBP

B
Cheapest Retailer
-
£354 GBP
Most Expensive
C
18carati
NK-9218JIF-0042 · Oct 31
£596 GBP
€760 EUR
View
1 more retailer has this diamond
Prices start from £354 GBPSave up to £242 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.

B
0.42ct Round
£354 GBP