CaratHunter
Plans
Round|Lab Grown|IGI

0.40ct J VVS2 Round Lab Grown Diamond

VG • J/VVS2 • IGI LGF6E41278

Certificate IGI LGF6E41278

Diamond specifications and retailer prices

From £275 GBP
As of November 1, 2026
Save £211 GBP (43%) vs most expensive(unlock to see where)
2 retailers carry this diamond
Most expensive: £486 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 VVS2 clarity (very-very-slightly-included), with a very-good cut grade and certified by IGI LGF6E41278 or F6E41278. Listed at 2 retailers as of October 31, 2026, with prices from £275 to £486, a £211 spread on the same certified stone. 18carati lists it at £486. 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

0.40
Carat
J
Colour
VVS2
Clarity
Very Good
Cut

Specifications

CutVery Good
PolishExcellent
SymmetryVery Good
FluorescenceFaint
OriginLab Grown
Grading LabIGI
CertificateIGI LGF6E41278
Dimensions4.89 × 4.90 × 2.79 mm
L/W Ratio1.00
Top View
4.89 mm4.90 mm0.40 ctJ / VVS2
OriginLab Grown
CutVery Good
PolishExcellent
SymmetryVery Good
FluorescenceFaint
CertificateIGI LGF6E41278
Side View
Table 64.5%CrownGirdlePavilionCulet: NoneDepth 57.0%

Caratlytics Score

How it works →
B
Good
Decent quality, room for better deals
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 1
Current: £486 GBP|Low: £263 GBP|High: £486 GBP|Avg: £376 GBP|+3.3%
18carati
Retailer 2
November 1, 2026
Retailer 2£275 GBP
18carati£486 GBP

32 data points across 2 retailers

2 retailers£275 GBP to £486 GBP

B
Cheapest Retailer
-
£275 GBP
Most Expensive
C
18carati
NK-1278JVVS2-0040 · Oct 31
£486 GBP
€620 EUR
View
1 more retailer has this diamond
Prices start from £275 GBPSave up to £211 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
£275 GBP