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Marquise|Natural|GIA

0.51ct I SI2 Marquise Natural Diamond

EX • I/SI2 • GIA 2557664386

Certificate GIA 2557664386

Diamond specifications and retailer prices

From $597 AUD
As of November 6, 2026
Save $1,276 AUD (68%) vs most expensive(unlock to see where)
4 retailers carry this diamond
Most expensive: $1,872 AUD at MOH London · As of November 7, 2026
View at MOH London

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 2557664386. Listed at 4 retailers as of November 6, 2026, with prices from $597 to $1,872, a $1,276 spread on the same certified stone. MOH London lists it at $1,872. 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
FluorescenceMedium
OriginNatural
Grading LabGIA
CertificateGIA 2557664386
Dimensions8.39 × 4.11 × 2.59 mm
L/W Ratio2.04
Top View
8.39 mm4.11 mm0.51 ctI / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceMedium
CertificateGIA 2557664386
Side View
Table 61.0%CrownGirdle: STK-VTKPavilionCulet: NoneDepth 62.9%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 6
Current: $1,872 AUD|Low: $597 AUD|High: $1,906 AUD|Avg: $1,158 AUD|-1.7%
MOH London
Retailer 2
Retailer 3
Retailer 4
November 7, 2026
Retailer 3$597 AUD
Retailer 2$988 AUD
Retailer 4$1,204 AUD
MOH London$1,872 AUD

44 data points across 4 retailers

4 retailers$597 AUD to $1,872 AUD

A
Cheapest Retailer
-
$597 AUD
B+
Retailer 2
-
$988 AUD
View
B
Retailer 3
-
$1,204 AUD
View
Most Expensive
B
MOH London
55019AB69 · Nov 7
$1,872 AUD
£1,013 GBP
View
3 more retailers have this diamond
Prices start from $597 AUDSave up to $1,276 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
$597 AUD