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Marquise|Natural|GIA

0.51ct J SI1 Marquise Natural Diamond

EX • J/SI1 • GIA 2546516427

Certificate GIA 2546516427

Diamond specifications and retailer prices

From $501 AUD
$351 USD
As of October 31, 2026
Save $1,206 AUD (71%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: $2,528 AUD at NZ Jewellers · As of October 6, 2026
View at NZ Jewellers

About this 0.51ct natural marquise diamond

This 0.51ct natural marquise sits in the half to three-quarter 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 2546516427. Listed at 10 retailers as of October 29, 2026, with a 241% 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

0.51
Carat
J
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
OriginNatural
Grading LabGIA
CertificateGIA 2546516427
Dimensions8.36 × 4.17 × 2.48 mm
L/W Ratio2.00
Top View
8.36 mm4.17 mm0.51 ctJ / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 2546516427
Side View
Table 61.0%CrownGirdle: STK-VTKPavilionCulet: NoneDepth 59.4%

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 31
Current: $537 AUD|Low: $464 AUD|High: $1,865 AUD|Avg: $898 AUD|-11.8%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
October 31, 2026
Retailer 4$501 AUD
Retailer 1$537 AUD
Retailer 6$621 AUD
Retailer 3$766 AUD
Retailer 7$775 AUD
Retailer 2$1,181 AUD
Retailer 5$1,707 AUD

44 data points across 7 retailers

10 retailers$501 AUD to $1,707 AUD

A
Cheapest Retailer
-
$501 AUD
$351 USD
Final sale: no returns
A
Retailer 2
-
$537 AUD
₹35,809 INR
View
A
Retailer 3
-
$621 AUD
HK$3,400 HKD
View
A
Retailer 4
-
$766 AUD
$537 USD
View
A
Retailer 5
-
$775 AUD
SGD 734 SGD
View
Retailer 6
-
$792 AUD
$555 USD
View
Price last confirmed 32 days ago
Retailer 7
-
$806 AUD
$565 USD
View
Price last confirmed 26 days ago
B+
Retailer 8
-
$1,181 AUD
£652 GBP
View
B
Retailer 9
-
$1,707 AUD
£942 GBP
View
Most Expensive
NZ Jewellers
6f3d0445-3b4e-4c59-925d-d0fd6e3d2d92 · Oct 6
$2,528 AUD
$1,772 USD
View
Price last confirmed 27 days ago
9 more retailers have this diamond
Prices start from $501 AUDSave up to $1,206 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
0.51ct Marquise
$501 AUD