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Marquise|Natural|IGI

1.51ct G SI2 Marquise Natural Diamond

ID • G/SI2 • IGI 811

Certificate IGI 811

Diamond specifications and retailer prices

From $5,496 AUD
As of November 4, 2026
Save $4,353 AUD (44%) vs most expensive(unlock to see where)
3 retailers carry this diamond
Most expensive: $9,849 AUD at Helzberg Diamonds · As of November 6, 2026
View at Helzberg Diamonds

About this 1.51ct natural marquise diamond

This 1.51ct natural marquise sits in the one-and-a-half to two carat band, graded G colour (near-colourless) and SI2 clarity (slightly-included), with a top-tier cut grade and certified by IGI. Listed at 3 retailers as of November 4, 2026, with prices from $5,496 to $9,849, a $4,353 spread on the same certified stone. Helzberg Diamonds lists it at $9,849. 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
G
Colour
SI2
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginNatural
Grading LabIGI
CertificateIGI 811
Dimensions11.36 × 6.01 × 3.71 mm
L/W Ratio1.89
Top View
11.36 mm6.01 mm1.51 ctG / SI2
OriginNatural
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI 811
Side View
Table 57.0%CrownGirdle: MED-STKPavilionCulet: NoneDepth 61.7%

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: Nov 4
Current: $9,849 AUD|Low: $4,838 AUD|High: $11,688 AUD|Avg: $7,905 AUD|-11.9%
Helzberg Diamonds
Retailer 2
Retailer 3
Retailer 4
Retailer 5
November 5, 2026
Retailer 5$4,838 AUD
Retailer 3$5,496 AUD
Retailer 2$5,822 AUD
Helzberg Diamonds$9,849 AUD
Retailer 4$11,688 AUD

22 data points across 5 retailers

3 retailers$5,496 AUD to $9,849 AUD

A
Cheapest Retailer
-
$5,496 AUD
A
Retailer 2
-
$5,822 AUD
View
Most Expensive
A
Helzberg Diamonds
ZXZOIKMGKMIN · Nov 6
$9,849 AUD
$6,767 USD
View
2 more retailers have this diamond
Prices start from $5,496 AUDSave up to $4,353 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
1.51ct Marquise
$5,496 AUD