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Marquise|Lab Grown|IGI

1.59ct E SI1 Marquise Lab Grown Diamond

EX • E/SI1 • IGI LG778674580

Shape and cutting style on the report: Marquise brilliant

Certificate IGI LG778674580

Diamond specifications and retailer prices

From £345 GBP
$462 USD
As of October 30, 2026
Save £467 GBP (58%) vs most expensive(unlock to see where)
5 retailers carry this diamond
Most expensive: £811 GBP at MOH London · As of October 29, 2026
View at MOH London

About this 1.59ct lab-grown marquise diamond

This 1.59ct 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 LG778674580 or 778674580. Listed at 5 retailers as of October 29, 2026, with prices from £345 to £811, a £467 spread on the same certified stone. MOH London lists it at £811. 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

1.59
Carat
E
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33.1°
Pavilion angle42.3°
OriginLab Grown
Grading LabIGI
CertificateIGI LG778674580
Dimensions11.00 × 6.28 × 4.04 mm
L/W Ratio1.75
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
11.00 mm6.28 mm1.59 ctE / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG778674580
Side View
Table 60.0%Crown 33.1°Girdle: STK-THKPavilion 42.3°Culet: NoneDepth 64.3%

Caratlytics Score

How it works →
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: Oct 30
Current: £811 GBP|Low: £326 GBP|High: £817 GBP|Avg: £497 GBP|-0.7%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
October 30, 2026
Retailer 4£345 GBP
Retailer 2£373 GBP
Retailer 5£374 GBP
Retailer 3£449 GBP
Retailer 6£694 GBP
MOH London£811 GBP

24 data points across 6 retailers

5 retailers£345 GBP to £811 GBP

B+
Cheapest Retailer
-
£345 GBP
$462 USD
A
Retailer 2
-
£373 GBP
View
B+
Retailer 3
-
£374 GBP
$501 USD
View
B+
Retailer 4
-
£449 GBP
$602 USD
View
Most Expensive
B
MOH London
LG778674580 · Oct 29
£811 GBP
View
4 more retailers have this diamond
Prices start from £345 GBPSave up to £467 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
1.59ct Marquise
£345 GBP