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Marquise|Natural|GIA

0.51ct E SI1 Marquise Natural Diamond

EX • E/SI1 • GIA 6541370134

Certificate GIA 6541370134

Diamond specifications and retailer prices

From $1,220 AUD
$857 USD
As of October 31, 2026
Save $1,467 AUD (55%) vs most expensive(unlock to see where)
23 retailers carry this diamond
Most expensive: $3,559 AUD at NZ Jewellers · As of October 30, 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 E colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 6541370134. Listed at 23 retailers as of October 29, 2026, with a 120% 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
E
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishVery Good
SymmetryExcellent
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 6541370134
Dimensions8.12 × 4.15 × 2.57 mm
L/W Ratio1.96
Top View
8.12 mm4.15 mm0.51 ctE / SI1
OriginNatural
CutExcellent
PolishVery Good
SymmetryExcellent
FluorescenceNone
CertificateGIA 6541370134
Side View
Table 63.0%CrownGirdle: MED-VTKPavilionCulet: NoneDepth 61.8%

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: $3,559 AUD|Low: $1,016 AUD|High: $3,559 AUD|Avg: $1,892 AUD
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
Retailer 14
Retailer 15
October 31, 2026
Retailer 13$1,220 AUD
Retailer 11$1,224 AUD
Retailer 4$1,323 AUD
Retailer 15$1,372 AUD
Retailer 3$1,489 AUD
Retailer 5$1,525 AUD
Retailer 12$1,545 AUD
Retailer 7$1,641 AUD
Retailer 2$1,711 AUD
Retailer 14$1,908 AUD
Retailer 8$2,049 AUD
Retailer 9$2,252 AUD
Retailer 6$2,363 AUD
Retailer 10$2,687 AUD
NZ Jewellers$3,559 AUD

46 data points across 15 retailers

23 retailers$1,220 AUD to $2,687 AUD

A
Cheapest Retailer
-
$1,220 AUD
$857 USD
Final sale: no returns
Retailer 2
-
$1,224 AUD
$860 USD
View
Price last confirmed 13 days ago
B+
Retailer 3
-
$1,307 AUD
$918 USD
View
B+
Retailer 4
-
$1,317 AUD
View
B+
Retailer 5
-
$1,323 AUD
$929 USD
View
B+
Retailer 6
-
$1,323 AUD
$929 USD
View
B+
Retailer 7
-
$1,335 AUD
$938 USD
View
B+
Retailer 8
-
$1,372 AUD
$964 USD
View
B+
Retailer 9
-
$1,489 AUD
$1,046 USD
View
B
Retailer 10
-
$1,525 AUD
$1,071 USD
View
B
Retailer 11
-
$1,545 AUD
$1,085 USD
View
B+
Retailer 12
-
$1,609 AUD
$1,130 USD
View
B+
Retailer 13
-
$1,609 AUD
$1,130 USD
View
B+
Retailer 14
-
$1,641 AUD
$1,153 USD
View
B+
Retailer 15
-
$1,666 AUD
$1,170 USD
View
B+
Retailer 16
-
$1,711 AUD
£946 GBP
View
Retailer 17
-
$1,908 AUD
View
Price last confirmed 27 days ago
B
Retailer 18
-
$1,921 AUD
$1,349 USD
View
B
Retailer 19
-
$2,049 AUD
€1,371 EUR
View
B
Retailer 20
-
$2,252 AUD
ZAR 25,560 ZAR
View
B
Retailer 21
-
$2,363 AUD
CA$2,306 CAD
View
B
Retailer 22
-
$2,687 AUD
£1,486 GBP
View
Most Expensive
NZ Jewellers
6fe8d8e1-b6e0-4a79-8df8-877dfdece077 · Oct 30
$3,559 AUD
$2,500 USD
View
Price under review
22 more retailers have this diamond
Prices start from $1,220 AUDSave up to $1,467 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
$1,220 AUD