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Marquise|Natural|GIA

1.20ct I SI2 Marquise Natural Diamond

EX • I/SI2 • GIA 2557877511

Certificate GIA 2557877511

Diamond specifications and retailer prices

From $4,327 AUD
As of November 6, 2026
Save $5,792 AUD (57%) vs most expensive(unlock to see where)
19 retailers carry this diamond
Most expensive: $10,119 AUD at NZ Jewellers · As of November 5, 2026
View at NZ Jewellers

About this 1.2ct natural marquise diamond

This 1.2ct natural marquise sits in the classic one-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 2557877511. Listed at 19 retailers as of November 5, 2026, with prices from $4,327 to $10,119, a $5,792 spread on the same certified stone. NZ Jewellers lists it at $10,119. 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

1.20
Carat
I
Colour
SI2
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishVery Good
SymmetryExcellent
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 2557877511
Dimensions10.35 × 5.44 × 3.47 mm
L/W Ratio1.90
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Crystal, Feather, Twinning Wisp, Cavity, Needle
Top View
10.35 mm5.44 mm1.20 ctI / SI2
OriginNatural
CutExcellent
PolishVery Good
SymmetryExcellent
FluorescenceNone
CertificateGIA 2557877511
Side View
Table 59.0%CrownGirdle: THK-VTKPavilionCulet: NDepth 63.9%

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: $10,119 AUD|Low: $4,327 AUD|High: $10,119 AUD|Avg: $6,297 AUD
NZ Jewellers
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 7, 2026
Retailer 7$4,327 AUD
Retailer 13$5,408 AUD
Retailer 4$5,516 AUD
Retailer 8$5,711 AUD
Retailer 3$5,809 AUD
Retailer 11$5,809 AUD
Retailer 12$5,809 AUD
Retailer 2$5,883 AUD
Retailer 5$5,923 AUD
Retailer 6$6,164 AUD
Retailer 9$6,372 AUD
Retailer 14$6,702 AUD
Retailer 10$9,712 AUD
NZ Jewellers$10,119 AUD

30 data points across 14 retailers

19 retailers$4,327 AUD to $10,119 AUD

A
Cheapest Retailer
-
$4,327 AUD
B+
Retailer 2
-
$4,617 AUD
View
Final sale: no returns
B+
Retailer 3
-
$4,828 AUD
View
B+
Retailer 4
-
$5,111 AUD
View
B+
Retailer 5
-
$5,408 AUD
View
B+
Retailer 6
-
$5,516 AUD
View
B+
Retailer 7
-
$5,711 AUD
View
B
Retailer 8
-
$5,809 AUD
View
B
Retailer 9
-
$5,809 AUD
View
Retailer 10
-
$5,809 AUD
View
Price last confirmed 9 days ago
B
Retailer 11
-
$5,883 AUD
View
B
Retailer 12
-
$5,923 AUD
View
B
Retailer 13
-
$6,021 AUD
View
B
Retailer 14
-
$6,164 AUD
View
B
Retailer 15
-
$6,185 AUD
View
B+
Retailer 16
-
$6,372 AUD
View
B
Retailer 17
-
$6,702 AUD
View
B
Retailer 18
-
$9,712 AUD
View
Most Expensive
C
NZ Jewellers
c2a31624-9175-4791-8f74-0e7976ecf87d · Nov 5
$10,119 AUD
$6,953 USD
View
18 more retailers have this diamond
Prices start from $4,327 AUDSave up to $5,792 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
1.20ct Marquise
$4,327 AUD