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Marquise|Natural|GIA

0.40ct J SI1 Marquise Natural Diamond

EX • J/SI1 • GIA 6545301868

Certificate GIA 6545301868

Diamond specifications and retailer prices

From $394 AUD
$276 USD
As of November 1, 2026
Save $958 AUD (71%) vs most expensive(unlock to see where)
8 retailers carry this diamond
Most expensive: $1,931 AUD at NZ Jewellers · As of September 21, 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 J colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 6545301868. Listed at 8 retailers as of November 1, 2026, with a 243% 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
J
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryVery Good
FluorescenceMedium
OriginNatural
Grading LabGIA
CertificateGIA 6545301868
Dimensions7.81 × 3.87 × 2.28 mm
L/W Ratio2.02
Top View
7.81 mm3.87 mm0.40 ctJ / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceMedium
CertificateGIA 6545301868
Side View
Table 56.0%CrownGirdle: THK-VTKPavilionCulet: NoneDepth 59.0%

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: Nov 1
Current: $772 AUD|Low: $311 AUD|High: $1,352 AUD|Avg: $605 AUD|+48.7%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
November 2, 2026
Retailer 9$311 AUD
Retailer 7$394 AUD
Retailer 8$438 AUD
Retailer 3$454 AUD
Retailer 10$454 AUD
Retailer 12$459 AUD
Retailer 5$486 AUD
Retailer 2$565 AUD
Retailer 4$632 AUD
Retailer 1$772 AUD
Retailer 11$986 AUD
Retailer 6$1,352 AUD

35 data points across 12 retailers

8 retailers$394 AUD to $1,352 AUD

A
Cheapest Retailer
-
$394 AUD
$276 USD
Retailer 2
-
$427 AUD
$299 USD
View
Price last confirmed 41 days ago
A
Retailer 3
-
$438 AUD
HK$2,400 HKD
View
A
Retailer 4
-
$486 AUD
SGD 460 SGD
View
Retailer 5
-
$574 AUD
$402 USD
View
Price last confirmed 41 days ago
B
Retailer 6
-
$772 AUD
£426 GBP
View
B
Retailer 7
-
$1,352 AUD
CA$1,316 CAD
View
Most Expensive
NZ Jewellers
dff665cc-3735-46fd-a963-5563b1b62cb7 · Sep 21
$1,931 AUD
$1,353 USD
View
Price under review
7 more retailers have this diamond
Prices start from $394 AUDSave up to $958 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
$394 AUD