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Marquise|Lab Grown|IGI

1.50ct G SI1 Marquise Lab Grown Diamond

EX • G/SI1 • IGI LG788659781

Shape and cutting style on the report: Marquise brilliant

Certificate IGI LG788659781

Diamond specifications and retailer prices

From $868 AUD
£480 GBP
As of October 31, 2026
Save $783 AUD (47%) vs most expensive(unlock to see where)
2 retailers carry this diamond
Most expensive: $1,651 AUD at Brilliant Earth · As of October 31, 2026
View at Brilliant Earth

About this 1.5ct lab-grown marquise diamond

This 1.5ct lab-grown marquise sits in the one-and-a-half to two carat band, graded G colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG788659781 or 788659781. Listed at 2 retailers as of October 31, 2026, with prices from $868 to $1,651, a $783 spread on the same certified stone. Brilliant Earth lists it at $1,651. 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

1.50
Carat
G
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.3°
Pavilion angle41°
OriginLab Grown
Grading LabIGI
CertificateIGI LG788659781
Dimensions11.28 × 5.97 × 3.83 mm
L/W Ratio1.89
Girdle conditionFaceted
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
11.28 mm5.97 mm1.50 ctG / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG788659781
Side View
Table 63.0%Crown 35.3°Girdle: STK-THKPavilion 41°Culet: NoneDepth 64.2%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 31
Current: $1,651 AUD|Low: $414 AUD|High: $1,651 AUD|Avg: $958 AUD
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
April 26, 2026
Retailer 4$414 AUD
Retailer 2$612 AUD
Retailer 3$787 AUD
Retailer 5$868 AUD
Brilliant Earth$1,651 AUD

5 data points across 5 retailers

2 retailers$868 AUD to $1,651 AUD

B+
Cheapest Retailer
-
$868 AUD
£480 GBP
Most Expensive
B
Brilliant Earth
18641082A · Oct 31
$1,651 AUD
$1,160 USD
View
1 more retailer has this diamond
Prices start from $868 AUDSave up to $783 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.

B+
1.50ct Marquise
$868 AUD