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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 $577 CAD
As of November 6, 2026
Save $1,240 CAD (68%) vs most expensive(unlock to see where)
4 retailers carry this diamond
Most expensive: $1,817 CAD at MOH London · As of November 4, 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 4, 2026, with prices from $577 to $1,817, a $1,240 spread on the same certified stone. MOH London lists it at $1,817. 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
Color
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
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 6
Current: $1,817 CAD|Low: $577 CAD|High: $1,842 CAD|Avg: $1,115 CAD|-1.3%
MOH London
Retailer 2
Retailer 3
Retailer 4
November 6, 2026
Retailer 2$577 CAD
Retailer 4$949 CAD
Retailer 3$1,163 CAD
MOH London$1,817 CAD

43 data points across 4 retailers

4 retailers$577 CAD to $1,817 CAD

A
Cheapest Retailer
-
$577 CAD
B+
Retailer 2
-
$949 CAD
View
B
Retailer 3
-
$1,163 CAD
View
Most Expensive
B
MOH London
55019AB69 · Nov 4
$1,817 CAD
£1,017 GBP
View
3 more retailers have this diamond
Prices start from $577 CADSave up to $1,240 CAD

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
$577 CAD