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Marquise|Lab Grown|IGI

1.59ct E SI1 Marquise Lab Grown Diamond

EX • E/SI1 • IGI LG840665554

Shape and cutting style on the report: Marquise brilliant

Certificate IGI LG840665554

Diamond specifications and retailer prices

From $325 AUD
$228 USD
As of October 30, 2026
Save $1,398 AUD (81%) vs most expensive(unlock to see where)
3 retailers carry this diamond
Most expensive: $1,723 AUD at Brilliant Earth · As of October 26, 2026
View at Brilliant Earth

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 LG840665554 or 840665554. Listed at 3 retailers as of October 26, 2026, with prices from $325 to $1,723, a $1,398 spread on the same certified stone. Brilliant Earth lists it at $1,723. 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 angle37.5°
Pavilion angle40.8°
OriginLab Grown
Grading LabIGI
CertificateIGI LG840665554
Dimensions11.61 × 6.04 × 3.90 mm
L/W Ratio1.92
Girdle conditionFaceted
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
11.61 mm6.04 mm1.59 ctE / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG840665554
Side View
Table 60.0%Crown 37.5°Girdle: MED-STKPavilion 40.8°Culet: NoneDepth 64.6%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
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Price History

Last verified: Oct 30
Current: $1,723 AUD|Low: $325 AUD|High: $1,723 AUD|Avg: $1,090 AUD
Brilliant Earth
Retailer 2
Retailer 3
October 27, 2026
Retailer 2$325 AUD
Retailer 3$685 AUD
Brilliant Earth$1,723 AUD

24 data points across 3 retailers

3 retailers$325 AUD to $1,723 AUD

A
Cheapest Retailer
-
$325 AUD
$228 USD
Final sale: no returns
A
Retailer 2
-
$685 AUD
£379 GBP
View
Most Expensive
B
Brilliant Earth
21703559A · Oct 26
$1,723 AUD
$1,210 USD
View
2 more retailers have this diamond
Prices start from $325 AUDSave up to $1,398 AUD

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
$325 AUD