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Round|Lab Grown|IGI

0.40ct F SI2 Round Lab Grown Diamond

EX • F/SI2 • IGI LG290500

Certificate IGI LG290500

Diamond specifications and retailer prices

From £299 GBP
$400 USD
As of October 31, 2026
Save £247 GBP (45%) vs most expensive(unlock to see where)
2 retailers carry this diamond
Most expensive: £546 GBP at Fonder Diamond · As of October 31, 2026
View at Fonder Diamond

About this 0.4ct lab-grown round diamond

This 0.4ct lab-grown round sits in the sub-half-carat band, graded F colour (colourless) and SI2 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG290500 or 290500. Listed at 2 retailers as of October 31, 2026, with prices from £299 to £546, a £247 spread on the same certified stone. Fonder Diamond lists it at £546. SI-grade stones are eye-clean roughly 60 to 70% of the time at this carat range. Check the inclusion plot on the cert and ask the retailer for high-resolution video before buying.

The 4Cs

0.40
Carat
F
Colour
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginLab Grown
Grading LabIGI
CertificateIGI LG290500
Dimensions4.73 × 4.71 × 2.90 mm
L/W Ratio1.00
Top View
4.73 mm4.71 mm0.40 ctF / SI2
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG290500
Side View
Table 60.0%CrownGirdle: MED-STKPavilionCulet: NoneDepth 61.4%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 31
Current: £546 GBP|Low: £299 GBP|High: £1,205 GBP|Avg: £558 GBP|-0.4%
Fonder Diamond
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
October 13, 2026
Retailer 2£299 GBP
Retailer 3£369 GBP
Retailer 5£410 GBP
Retailer 6£516 GBP
Fonder Diamond£546 GBP
Retailer 4£1,205 GBP

4 data points across 6 retailers

2 retailers£299 GBP to £546 GBP

B+
Cheapest Retailer
-
£299 GBP
$400 USD
Most Expensive
B
Fonder Diamond
96961304 · Oct 31
£546 GBP
SGD 988 SGD
View
1 more retailer has this diamond
Prices start from £299 GBPSave up to £247 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
£299 GBP