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Round|Lab Grown|IGI

0.40ct H SI1 Round Lab Grown Diamond

EX • H/SI1 • IGI LGY-24910

Certificate IGI LGY-24910

Diamond specifications and retailer prices

From £321 GBP
$430 USD
As of October 31, 2026
Save £225 GBP (41%) 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 H colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LGY-24910 or Y-24910. Listed at 2 retailers as of October 31, 2026, with prices from £321 to £546, a £225 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
H
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginLab Grown
Grading LabIGI
CertificateIGI LGY-24910
Dimensions4.82 × 4.84 mm
L/W Ratio1.00
Top View
4.82 mm4.84 mm0.40 ctH / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LGY-24910
Side View
Table 61.0%CrownGirdle: THN - MEDPavilionCulet: NDepth 58.8%

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: Oct 31
Current: £546 GBP|Low: £248 GBP|High: £970 GBP|Avg: £539 GBP|-0.4%
Fonder Diamond
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
October 13, 2026
Retailer 2£248 GBP
Retailer 3£321 GBP
Retailer 5£537 GBP
Fonder Diamond£546 GBP
Retailer 6£610 GBP
Retailer 4£970 GBP

4 data points across 6 retailers

2 retailers£321 GBP to £546 GBP

B
Cheapest Retailer
-
£321 GBP
$430 USD
Most Expensive
B
Fonder Diamond
96932507 · Oct 31
£546 GBP
SGD 988 SGD
View
1 more retailer has this diamond
Prices start from £321 GBPSave up to £225 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
£321 GBP