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Marquise|Lab Grown|IGI

1.51ct E SI1 Marquise Lab Grown Diamond

EX • E/SI1 • IGI LG786663665

Shape and cutting style on the report: Marquise brilliant

Certificate IGI LG786663665

Diamond specifications and retailer prices

From £906 GBP
$1,220 USD
As of November 4, 2026
1 retailer carries this diamond
Only listing: £906 GBP at Brilliant Earth
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 Brilliant Earth

About this 1.51ct lab-grown marquise diamond

This 1.51ct lab-grown marquise sits in the one-and-a-half to two carat band, graded E colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG786663665 or 786663665. Listed at a single retailer as of November 4, 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

1.51
Carat
E
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.4°
Pavilion angle40.3°
OriginLab Grown
Grading LabIGI
CertificateIGI LG786663665
Dimensions12.08 × 6.04 × 3.68 mm
L/W Ratio2.00
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
12.08 mm6.04 mm1.51 ctE / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG786663665
Side View
Table 59.0%Crown 34.4°Girdle: MED-STKPavilion 40.3°Culet: NoneDepth 60.9%

Caratlytics Score

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B
Good
Decent quality, room for better deals
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Price History

Last verified: Nov 4
Current: £906 GBP|Low: £290 GBP|High: £951 GBP|Avg: £448 GBP|-4.7%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
April 24, 2026
Retailer 4£290 GBP
Retailer 3£363 GBP
Retailer 2£443 GBP
Brilliant Earth£906 GBP

13 data points across 4 retailers

1 retailer

B
Brilliant Earth
18424233A · Nov 4
£906 GBP
$1,220 USD
View

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B
1.51ct Marquise
£906 GBP