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Marquise|Natural|GIA

0.51ct I SI1 Marquise Natural Diamond

EX • I/SI1 • GIA 7556820403

Certificate GIA 7556820403

Diamond specifications and retailer prices

From $953 AUD
SGD 903 SGD
As of October 31, 2026
Save $611 AUD (39%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: $1,564 AUD at Frank Darling · As of November 2, 2026
View at Frank Darling

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 SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 7556820403. Listed at 11 retailers as of October 31, 2026, with prices from $953 to $1,564, a $611 spread on the same certified stone. Frank Darling lists it at $1,564. 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
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
Crown angle39.1°
Pavilion angle39.97°
OriginNatural
Grading LabGIA
CertificateGIA 7556820403
Dimensions8.47 × 3.98 × 2.54 mm
L/W Ratio2.13
Culet sizeNone
Top View
8.47 mm3.98 mm0.51 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateGIA 7556820403
Side View
Table 59.0%Crown 39.1°Girdle: MED-VTKPavilion 39.97°Culet: NoneDepth 63.7%

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: Oct 31
Current: $1,564 AUD|Low: $953 AUD|High: $1,564 AUD|Avg: $1,285 AUD
Frank Darling
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
November 3, 2026
Retailer 6$953 AUD
Retailer 2$1,121 AUD
Retailer 3$1,342 AUD
Retailer 4$1,411 AUD
Retailer 5$1,431 AUD
Frank Darling$1,564 AUD

46 data points across 6 retailers

11 retailers$953 AUD to $1,564 AUD

A
Cheapest Retailer
-
$953 AUD
SGD 903 SGD
B+
Retailer 2
-
$963 AUD
SGD 912 SGD
View
B+
Retailer 3
-
$1,022 AUD
$716 USD
View
B+
Retailer 4
-
$1,121 AUD
£618 GBP
View
B
Retailer 5
-
$1,194 AUD
$837 USD
View
B
Retailer 6
-
$1,253 AUD
$878 USD
View
B
Retailer 7
-
$1,342 AUD
€896 EUR
View
B
Retailer 8
-
$1,347 AUD
$944 USD
View
B
Retailer 9
-
$1,411 AUD
$989 USD
View
Retailer 10
-
$1,431 AUD
$1,003 USD
View
Price last confirmed 7 days ago
Most Expensive
B
Frank Darling
2667831HK · Nov 2
$1,564 AUD
$1,096 USD
View
10 more retailers have this diamond
Prices start from $953 AUDSave up to $611 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
$953 AUD