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Marquise|Natural|GIA

0.51ct I SI2 Marquise Natural Diamond

EX • I/SI2 • GIA 6551764597

Certificate GIA 6551764597

Diamond specifications and retailer prices

From $790 AUD
As of November 3, 2026
Save $1,688 AUD (68%) vs most expensive(unlock to see where)
6 retailers carry this diamond
Most expensive: $2,479 AUD at NZ Jewellers · As of November 3, 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 I colour (near-colourless) and SI2 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 6551764597. Listed at 6 retailers as of November 3, 2026, with prices from $790 to $2,479, a $1,688 spread on the same certified stone. NZ Jewellers lists it at $2,479. 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
I
Colour
SI2
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 6551764597
Dimensions7.98 × 3.83 × 2.38 mm
L/W Ratio2.08
Girdle conditionThick
Key to symbols
Twinning Wisp
Top View
7.98 mm3.83 mm0.51 ctI / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateGIA 6551764597
Side View
Table 61.0%CrownGirdlePavilionCulet: NoneDepth 62.2%

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 3
Current: $2,479 AUD|Low: $790 AUD|High: $2,538 AUD|Avg: $1,365 AUD|-2.4%
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
November 2, 2026
Retailer 4$790 AUD
Retailer 6$851 AUD
Retailer 2$943 AUD
Retailer 5$1,039 AUD
Retailer 3$1,824 AUD
NZ Jewellers$2,479 AUD

28 data points across 6 retailers

6 retailers$790 AUD to $2,479 AUD

A
Cheapest Retailer
-
$790 AUD
A
Retailer 2
-
$851 AUD
View
A
Retailer 3
-
$943 AUD
View
B+
Retailer 4
-
$1,039 AUD
View
B
Retailer 5
-
$1,824 AUD
View
Most Expensive
B
NZ Jewellers
c3f34689-ff0b-44b5-8d2f-fa347761345c · Nov 3
$2,479 AUD
$1,703 USD
View
5 more retailers have this diamond
Prices start from $790 AUDSave up to $1,688 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
$790 AUD