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Marquise|Lab Grown|IGI

1.56ct F SI1 Marquise Lab Grown Diamond

EX • F/SI1 • IGI LG786663668

Shape and cutting style on the report: Marquise brilliant

Certificate IGI LG786663668

Diamond specifications and retailer prices

From £917 GBP
$1,230 USD
As of October 31, 2026
1 retailer carries this diamond
Only listing: £917 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 1.56ct lab-grown marquise diamond

This 1.56ct lab-grown marquise sits in the one-and-a-half to two carat band, graded F colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG786663668 or 786663668. 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

1.56
Carat
F
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.7°
Pavilion angle40.5°
OriginLab Grown
Grading LabIGI
CertificateIGI LG786663668
Dimensions11.73 × 6.18 × 3.78 mm
L/W Ratio1.90
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
11.73 mm6.18 mm1.56 ctF / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG786663668
Side View
Table 63.0%Crown 35.7°Girdle: MED-STKPavilion 40.5°Culet: NoneDepth 61.2%

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: £917 GBP|Low: £293 GBP|High: £961 GBP|Avg: £516 GBP|-4.7%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
April 24, 2026
Retailer 6£293 GBP
Retailer 4£301 GBP
Retailer 5£367 GBP
Retailer 2£618 GBP
Retailer 3£655 GBP
Brilliant Earth£917 GBP

13 data points across 6 retailers

1 retailer

B
Brilliant Earth
18424322A · Oct 31
£917 GBP
$1,230 USD
View

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
1.56ct Marquise
£917 GBP