Marquise|Lab Grown|IGI

1.40ct E SI1 Marquise Lab Grown Diamond

EX • E/SI1 • IGI LG788602868

Shape and cutting style on the report: Marquise brilliant

Certificate IGI LG788602868

Diamond specifications and retailer prices

From $492 USD
£388 GBP
As of October 31, 2026
1 retailer carries this diamond
Only listing: $492 USD at Diamond Quarter
Only one retailer lists this diamond right now, and it is shown above, so there is nothing to unlock. Similar diamonds are carried by several retailers.
View at Diamond Quarter

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 E colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG788602868 or 788602868. Listed at a single retailer as of October 31, 2026. If it later appears at another store, Carat Hunter will surface the price comparison automatically. 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

1.40
Carat
E
Color
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.4°
Pavilion angle40.9°
OriginLab Grown
Grading LabIGI
CertificateIGI LG788602868
Dimensions11.61 × 5.87 × 3.64 mm
L/W Ratio1.98
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
11.61 mm5.87 mm1.40 ctE / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG788602868
Side View
Table 62.0%Crown 34.4°Girdle: MED-STKPavilion 40.9°Culet: NoneDepth 62.0%

Caratlytics Score

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B
Good
Decent quality, room for better deals
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Price History

Last verified: Oct 31
Current: $492 USD|Low: $104 USD|High: $1,600 USD|Avg: $715 USD
Diamond Quarter
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
August 26, 2026
Retailer 3$104 USD
Retailer 6$312 USD
Retailer 5$371 USD
Diamond Quarter$492 USD
Retailer 2$505 USD
Retailer 7$522 USD
Retailer 8$632 USD
Retailer 10$806 USD
Retailer 9$822 USD
Retailer 4$1,000 USD

61 data points across 10 retailers

1 retailer

B
Diamond Quarter
1.4SI1ELG522EECN · Oct 31
$492 USD
£388 GBP
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B
1.40ct Marquise
$492 USD