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Marquise|Natural|GIA

0.51ct K SI2 Marquise Natural Diamond

GD • K/SI2 • GIA 6194969419

Certificate GIA 6194969419

Diamond specifications and retailer prices

From $830 AUD
As of November 1, 2026
Save $1,390 AUD (63%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: $3,017 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 SI2 clarity (slightly-included), with a standard cut grade stated by the retailer rather than the lab and certified by GIA 6194969419. Listed at 12 retailers as of November 1, 2026, with a 168% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. Cut grade matters more than carat or clarity for visible brilliance. If you can shift budget toward an Excellent or Ideal cut, do it before chasing higher colour or clarity.

The 4Cs

0.51
Carat
K
Colour
SI2
Clarity
Good
Cut (retailer stated)

Specifications

Cut (retailer stated)Good
PolishExcellent
SymmetryVery Good
FluorescenceFaint
OriginNatural
Grading LabGIA
CertificateGIA 6194969419
Dimensions7.54 × 4.39 × 2.65 mm
L/W Ratio1.72
Top View
7.54 mm4.39 mm0.51 ctK / SI2
OriginNatural
CutGood
PolishExcellent
SymmetryVery Good
FluorescenceFaint
CertificateGIA 6194969419
Side View
Table 55.0%CrownGirdle: STK-VTKPavilionCulet: NoneDepth 60.4%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 1
Current: $3,017 AUD|Low: $830 AUD|High: $3,017 AUD|Avg: $1,333 AUD
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
November 6, 2026
Retailer 5$830 AUD
Retailer 7$872 AUD
Retailer 10$907 AUD
Retailer 6$939 AUD
Retailer 9$939 AUD
Retailer 8$1,006 AUD
Retailer 3$1,175 AUD
Retailer 2$1,284 AUD
Retailer 4$2,219 AUD
NZ Jewellers$3,017 AUD

41 data points across 10 retailers

12 retailers$830 AUD to $2,219 AUD

B+
Cheapest Retailer
-
$830 AUD
B+
Retailer 2
-
$872 AUD
View
B+
Retailer 3
-
$901 AUD
View
B+
Retailer 4
-
$907 AUD
View
Retailer 5
-
$939 AUD
View
Price last confirmed 9 days ago
B
Retailer 6
-
$939 AUD
View
B
Retailer 7
-
$1,006 AUD
View
B
Retailer 8
-
$1,065 AUD
View
B
Retailer 9
-
$1,175 AUD
View
B
Retailer 10
-
$1,284 AUD
View
C
Retailer 11
-
$2,219 AUD
View
Most Expensive
NZ Jewellers
a755aec9-ce16-4e04-8139-e7b5f382ec80 · Nov 5
$3,017 AUD
$2,073 USD
View
Price under review
11 more retailers have this diamond
Prices start from $830 AUDSave up to $1,390 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.

B+
0.51ct Marquise
$830 AUD