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Marquise|Natural|IGI

0.40ct I SI2 Marquise Natural Diamond

EX • I/SI2 • IGI 823659617

Shape and cutting style on the report: Marquise brilliant

Certificate IGI 823659617

Diamond specifications and retailer prices

From $429 AUD
$301 USD
As of October 29, 2026
Save $568 AUD (57%) vs most expensive(unlock to see where)
7 retailers carry this diamond
Most expensive: $1,942 AUD at NZ Jewellers · As of October 30, 2026
View at NZ Jewellers

About this 0.4ct natural marquise diamond

This 0.4ct natural marquise sits in the sub-half-carat band, graded I colour (near-colourless) and SI2 clarity (slightly-included), with a top-tier cut grade and certified by IGI 823659617. Listed at 7 retailers as of October 29, 2026, with a 132% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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

0.40
Carat
I
Colour
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
Crown angle34.5°
Pavilion angle40.9°
OriginNatural
Grading LabIGI
CertificateIGI 823659617
Dimensions7.34 × 3.96 × 2.46 mm
L/W Ratio1.85
Girdle conditionFaceted
Top View
7.34 mm3.96 mm0.40 ctI / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateIGI 823659617
Side View
Table 61.0%Crown 34.5°Girdle: THN-STKPavilion 40.9°CuletDepth 62.1%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 29
Current: $1,942 AUD|Low: $429 AUD|High: $1,942 AUD|Avg: $894 AUD
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
October 31, 2026
Retailer 6$429 AUD
Retailer 5$478 AUD
Retailer 7$605 AUD
Retailer 2$740 AUD
Retailer 3$870 AUD
Retailer 4$996 AUD
NZ Jewellers$1,942 AUD

36 data points across 7 retailers

7 retailers$429 AUD to $996 AUD

A
Cheapest Retailer
-
$429 AUD
$301 USD
A
Retailer 2
-
$478 AUD
$336 USD
View
B+
Retailer 3
-
$605 AUD
$425 USD
View
B
Retailer 4
-
$740 AUD
€495 EUR
View
B
Retailer 5
-
$870 AUD
£481 GBP
View
B
Retailer 6
-
$996 AUD
£551 GBP
View
Most Expensive
NZ Jewellers
c5fc5f80-381e-421a-aa91-75063eddb7e9 · Oct 30
$1,942 AUD
$1,364 USD
View
Price under review
6 more retailers have this diamond
Prices start from $429 AUDSave up to $568 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
0.40ct Marquise
$429 AUD