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Round|Lab Grown|IGI

0.40ct J IF Round Lab Grown Diamond

EX • J/IF • IGI LGF5E98599

Certificate IGI LGF5E98599

Diamond specifications and retailer prices

From £337 GBP
As of October 31, 2026
Save £235 GBP (41%) vs most expensive(unlock to see where)
2 retailers carry this diamond
Most expensive: £572 GBP at 18carati · As of October 31, 2026
View at 18carati

About this 0.4ct lab-grown round diamond

This 0.4ct lab-grown round sits in the sub-half-carat band, graded J colour (near-colourless) and IF clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LGF5E98599 or F5E98599. Listed at 2 retailers as of October 31, 2026, with prices from £337 to £572, a £235 spread on the same certified stone. 18carati lists it at £572. Flawless clarity in sub-one-carat stones is rarely visible to the naked eye over VS1, so you are paying a meaningful premium for grade rather than appearance.

The 4Cs

0.40
Carat
J
Colour
IF
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
OriginLab Grown
Grading LabIGI
CertificateIGI LGF5E98599
Dimensions4.65 × 4.70 × 2.93 mm
L/W Ratio1.01
Top View
4.65 mm4.70 mm0.40 ctJ / IF
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateIGI LGF5E98599
Side View
Table 58.5%CrownGirdlePavilionCulet: NoneDepth 62.7%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
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Price History

Last verified: Oct 31
Current: £572 GBP|Low: £322 GBP|High: £572 GBP|Avg: £449 GBP|+4.3%
18carati
Retailer 2
October 31, 2026
Retailer 2£337 GBP
18carati£572 GBP

31 data points across 2 retailers

2 retailers£337 GBP to £572 GBP

B+
Cheapest Retailer
-
£337 GBP
Most Expensive
B
18carati
NK-8599JIF-0040 · Oct 31
£572 GBP
€730 EUR
View
1 more retailer has this diamond
Prices start from £337 GBPSave up to £235 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+
0.40ct Round
£337 GBP