Marquise|Lab Grown|IGI

1.40ct F FL Marquise Lab Grown Diamond

EX • F/FL • IGI LG813601658

Shape and cutting style on the report: Marquise brilliant

Certificate IGI LG813601658

Diamond specifications and retailer prices

From £526 GBP
As of November 4, 2026
Save £1,006 GBP (66%) vs most expensive(unlock to see where)
9 retailers carry this diamond
Most expensive: £2,177 GBP at Brilliant Earth · As of October 3, 2026
View at Brilliant Earth

About this 1.4ct lab-grown marquise diamond

This 1.4ct lab-grown marquise sits in the one-and-a-quarter to one-and-a-half carat band, graded F colour (colourless) and FL clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG813601658 or 813601658. Listed at 9 retailers as of November 4, 2026, with a 191% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.40
Carat
F
Colour
FL
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.3°
Pavilion angle40.5°
OriginLab Grown
Grading LabIGI
CertificateIGI LG813601658
Dimensions12.01 × 5.76 × 3.47 mm
L/W Ratio2.09
Girdle conditionFaceted
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
12.01 mm5.76 mm1.40 ctF / FL
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG813601658
Side View
Table 62.0%Crown 34.3°Girdle: THN-MEDPavilion 40.5°Culet: NoneDepth 60.2%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 4
Current: £1,486 GBP|Low: £299 GBP|High: £2,184 GBP|Avg: £887 GBP|-32.0%
Brilliant Earth
Retailer 2
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October 30, 2026
Retailer 19£332 GBP
Retailer 3£442 GBP
Retailer 9£496 GBP
Retailer 17£509 GBP
Retailer 12£526 GBP
Retailer 2£549 GBP
Retailer 18£565 GBP
Retailer 5£590 GBP
Retailer 4£605 GBP
Retailer 15£718 GBP
Retailer 8£807 GBP
Retailer 13£1,084 GBP
Retailer 10£1,096 GBP
Retailer 7£1,181 GBP
Retailer 11£1,265 GBP
Retailer 6£1,311 GBP
Brilliant Earth£1,486 GBP
Retailer 14£1,504 GBP
Retailer 16£1,532 GBP

19 data points across 19 retailers

9 retailers£526 GBP to £1,532 GBP

A
Cheapest Retailer
-
£526 GBP
A
Retailer 2
-
£549 GBP
View
Retailer 3
-
£565 GBP
View
Price last confirmed 36 days ago
B+
Retailer 4
-
£718 GBP
View
B
Retailer 5
-
£1,084 GBP
View
B
Retailer 6
-
£1,486 GBP
View
B
Retailer 7
-
£1,504 GBP
View
B
Retailer 8
-
£1,532 GBP
View
Most Expensive
Brilliant Earth
20553964A · Oct 3
£2,177 GBP
$2,930 USD
View
Price last confirmed 33 days ago
8 more retailers have this diamond
Prices start from £526 GBPSave up to £1,006 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
1.40ct Marquise
£526 GBP