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Marquise|Natural|GIA

0.51ct K SI1 Marquise Natural Diamond

EX • K/SI1 • GIA 6542875575

Certificate GIA 6542875575

Diamond specifications and retailer prices

From $587 AUD
As of November 5, 2026
Save $1,661 AUD (74%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: $2,248 AUD at NZ Jewellers · As of November 5, 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 K colour (faint-tinted) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 6542875575. Listed at 11 retailers as of November 5, 2026, with prices from $587 to $2,248, a $1,661 spread on the same certified stone. NZ Jewellers lists it at $2,248. 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
K
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
OriginNatural
Grading LabGIA
CertificateGIA 6542875575
Dimensions8.25 × 4.10 × 2.70 mm
L/W Ratio2.01
Top View
8.25 mm4.10 mm0.51 ctK / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 6542875575
Side View
Table 57.0%CrownGirdle: STK-VTKPavilionCulet: NoneDepth 65.9%

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 5
Current: $2,248 AUD|Low: $587 AUD|High: $2,318 AUD|Avg: $882 AUD|-3.0%
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 6, 2026
Retailer 9$587 AUD
Retailer 7$631 AUD
Retailer 3$639 AUD
Retailer 4$639 AUD
Retailer 8$677 AUD
Retailer 10$677 AUD
Retailer 2$716 AUD
Retailer 5$719 AUD
Retailer 11$893 AUD
Retailer 6$1,353 AUD
NZ Jewellers$2,248 AUD

36 data points across 11 retailers

11 retailers$587 AUD to $2,248 AUD

A
Cheapest Retailer
-
$587 AUD
A
Retailer 2
-
$631 AUD
View
Retailer 3
-
$639 AUD
View
Price last confirmed 8 days ago
A
Retailer 4
-
$639 AUD
View
A
Retailer 5
-
$677 AUD
View
A
Retailer 6
-
$677 AUD
View
A
Retailer 7
-
$716 AUD
View
A
Retailer 8
-
$719 AUD
View
B+
Retailer 9
-
$893 AUD
View
B
Retailer 10
-
$1,353 AUD
View
Most Expensive
B
NZ Jewellers
6fbe9dc0-4941-4bfd-b195-6b925748c946 · Nov 5
$2,248 AUD
$1,574 USD
View
10 more retailers have this diamond
Prices start from $587 AUDSave up to $1,661 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
$587 AUD