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Marquise|Natural|GIA

0.51ct E SI1 Marquise Natural Diamond

EX • E/SI1 • GIA 6565212812

Certificate GIA 6565212812

Diamond specifications and retailer prices

From $833 AUD
As of November 6, 2026
Save $2,524 AUD (75%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: $3,812 AUD at MOH London · As of November 2, 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 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 6565212812. Listed at 15 retailers as of November 5, 2026, with a 303% 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
SymmetryVery Good
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 6565212812
Dimensions8.68 × 4.06 × 2.46 mm
L/W Ratio2.14
Culet sizeNone
Top View
8.68 mm4.06 mm0.51 ctE / SI1
OriginNatural
CutExcellent
PolishVery Good
SymmetryVery Good
FluorescenceNone
CertificateGIA 6565212812
Side View
Table 59.0%CrownGirdle: MED-VTKPavilionCulet: NoneDepth 60.7%

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: $3,812 AUD|Low: $833 AUD|High: $3,812 AUD|Avg: $1,611 AUD
MOH London
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
November 6, 2026
Retailer 2$833 AUD
Retailer 6$1,043 AUD
Retailer 7$1,457 AUD
Retailer 8$1,538 AUD
Retailer 4$1,907 AUD
Retailer 10$2,008 AUD
Retailer 13$2,176 AUD
Retailer 3$2,214 AUD
Retailer 14$2,300 AUD
Retailer 5$2,510 AUD
Retailer 11$2,670 AUD
Retailer 12$2,677 AUD
Retailer 9$3,357 AUD
MOH London$3,812 AUD

39 data points across 14 retailers

15 retailers$833 AUD to $3,357 AUD

A
Cheapest Retailer
-
$833 AUD
A
Retailer 2
-
$1,014 AUD
View
Retailer 3
-
$1,043 AUD
View
Price last confirmed 18 days ago
B+
Retailer 4
-
$1,457 AUD
View
B+
Retailer 5
-
$1,538 AUD
View
B
Retailer 6
-
$1,907 AUD
View
B
Retailer 7
-
$2,008 AUD
View
Final sale: no returns
B
Retailer 8
-
$2,176 AUD
View
B
Retailer 9
-
$2,214 AUD
View
B
Retailer 10
-
$2,300 AUD
View
B
Retailer 11
-
$2,510 AUD
View
B
Retailer 12
-
$2,670 AUD
View
B
Retailer 13
-
$2,677 AUD
View
C
Retailer 14
-
$3,357 AUD
View
Most Expensive
MOH London
239CFF363 · Nov 2
$3,812 AUD
£2,101 GBP
View
Price under review
14 more retailers have this diamond
Prices start from $833 AUDSave up to $2,524 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
$833 AUD