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Round|Lab Grown|IGI

0.40ct J IF Round Lab Grown Diamond

EX • J/IF • IGI LGF6D39120

Certificate IGI LGF6D39120

Diamond specifications and retailer prices

From £337 GBP
As of October 31, 2026
1 retailer carries this diamond
Only listing: £337 GBP at 77 Diamonds
Only one retailer lists this diamond right now, and it is shown above, so there is nothing to unlock. Similar diamonds are carried by several retailers.
View at 77 Diamonds

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 LGF6D39120 or F6D39120. Listed at a single retailer as of October 31, 2026. If it later appears at another store, Carat Hunter will surface the price comparison automatically. 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
FluorescenceNone
OriginLab Grown
Grading LabIGI
CertificateIGI LGF6D39120
Dimensions4.77 × 4.81 × 2.83 mm
L/W Ratio1.01
Top View
4.77 mm4.81 mm0.40 ctJ / IF
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LGF6D39120
Side View
Table 63.0%CrownGirdlePavilionCulet: NoneDepth 59.1%

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: £337 GBP|Low: £322 GBP|High: £572 GBP|Avg: £449 GBP|+0.5%
77 Diamonds
Retailer 2
October 31, 2026
77 Diamonds£337 GBP
Retailer 2£572 GBP

31 data points across 2 retailers

1 retailer

B
77 Diamonds
RBCF87XMRQGQ · Oct 31
£337 GBP
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B
0.40ct Round
£337 GBP