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Marquise|Natural|GIA

1.20ct D SI2 Marquise Natural Diamond

EX • D/SI2 • GIA 3555937032

Certificate GIA 3555937032

Diamond specifications and retailer prices

From $5,337 AUD
As of November 4, 2026
Save $4,226 AUD (44%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: $9,563 AUD at Helzberg Diamonds · As of November 6, 2026
View at Helzberg Diamonds

About this 1.2ct natural marquise diamond

This 1.2ct natural marquise sits in the classic one-carat band, graded D colour (colourless) and SI2 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 3555937032. Listed at 11 retailers as of November 4, 2026, with prices from $5,337 to $9,563, a $4,226 spread on the same certified stone. Helzberg Diamonds lists it at $9,563. 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
D
Colour
SI2
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
Crown angle38.76°
Pavilion angle40.92°
OriginNatural
Grading LabGIA
CertificateGIA 3555937032
Dimensions10.44 × 5.50 × 3.54 mm
L/W Ratio1.90
Culet sizeNone
Top View
10.44 mm5.50 mm1.20 ctD / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 3555937032
Side View
Table 57.0%Crown 38.76°Girdle: THN-THKPavilion 40.92°Culet: NoneDepth 64.3%

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 4
Current: $9,563 AUD|Low: $5,337 AUD|High: $10,160 AUD|Avg: $6,872 AUD|-5.9%
Helzberg Diamonds
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 6, 2026
Retailer 7$5,337 AUD
Retailer 6$5,382 AUD
Retailer 5$5,466 AUD
Retailer 8$5,704 AUD
Retailer 11$5,826 AUD
Retailer 4$6,121 AUD
Retailer 9$6,760 AUD
Retailer 10$6,811 AUD
Retailer 2$6,861 AUD
Retailer 3$9,555 AUD
Helzberg Diamonds$9,563 AUD

42 data points across 11 retailers

11 retailers$5,337 AUD to $9,563 AUD

A
Cheapest Retailer
-
$5,337 AUD
A
Retailer 2
-
$5,382 AUD
View
A
Retailer 3
-
$5,466 AUD
View
A
Retailer 4
-
$5,704 AUD
View
A
Retailer 5
-
$5,826 AUD
View
A
Retailer 6
-
$6,121 AUD
View
B+
Retailer 7
-
$6,760 AUD
View
B+
Retailer 8
-
$6,811 AUD
View
B+
Retailer 9
-
$6,861 AUD
View
B
Retailer 10
-
$9,555 AUD
View
Most Expensive
B
Helzberg Diamonds
XZRJLLLPJNGJI · Nov 6
$9,563 AUD
$6,571 USD
View
10 more retailers have this diamond
Prices start from $5,337 AUDSave up to $4,226 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
$5,337 AUD