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Marquise|Lab Grown|IGI

0.40ct F SI1 Marquise Lab Grown Diamond

ID • F/SI1 • IGI LG538275500

Shape and cutting style on the report: Marquise brilliant

Certificate IGI LG538275500

Diamond specifications and retailer prices

From £77 GBP
$104 USD
As of November 2, 2026
Save £230 GBP (75%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: £800 GBP at MOH London · As of November 2, 2026
View at MOH London

About this 0.4ct lab-grown marquise diamond

This 0.4ct lab-grown marquise sits in the sub-half-carat band, graded F colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG538275500 or 538275500. Listed at 12 retailers as of October 31, 2026, with a 297% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryVery Good
FluorescenceNone
Crown angle30.1°
Pavilion angle42.2°
OriginLab Grown
Grading LabIGI
CertificateIGI LG538275500
Dimensions7.36 × 3.89 × 2.47 mm
L/W Ratio1.89
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process and may include post-growth treatment Type IIa
Top View
7.36 mm3.89 mm0.40 ctF / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateIGI LG538275500
Side View
Table 62.5%Crown 30.1°Girdle: MED-STKPavilion 42.2°Culet: NoneDepth 63.5%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 2
Current: £800 GBP|Low: £74 GBP|High: £809 GBP|Avg: £243 GBP|-0.1%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 3, 2026
Retailer 6£77 GBP
Retailer 10£89 GBP
Retailer 7£102 GBP
Retailer 11£102 GBP
Retailer 4£171 GBP
Retailer 2£188 GBP
Retailer 9£193 GBP
Retailer 5£246 GBP
Retailer 3£265 GBP
Retailer 8£308 GBP
MOH London£800 GBP

44 data points across 11 retailers

12 retailers£77 GBP to £308 GBP

A
Cheapest Retailer
-
£77 GBP
$104 USD
A
Retailer 2
-
£89 GBP
$120 USD
View
A
Retailer 3
-
£102 GBP
$137 USD
View
Retailer 4
-
£102 GBP
$137 USD
View
Price last confirmed 9 days ago
B+
Retailer 5
-
£171 GBP
$230 USD
View
B+
Retailer 6
-
£188 GBP
View
B+
Retailer 7
-
£193 GBP
$259 USD
View
B+
Retailer 8
-
£229 GBP
HK$2,400 HKD
View
B+
Retailer 9
-
£246 GBP
View
B
Retailer 10
-
£265 GBP
$355 USD
View
B
Retailer 11
-
£308 GBP
$413 USD
View
Most Expensive
MOH London
LG538275500 · Nov 2
£800 GBP
View
Price under review
11 more retailers have this diamond
Prices start from £77 GBPSave up to £230 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.

A
0.40ct Marquise
£77 GBP