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Marquise|Natural|GIA

1.20ct I SI1 Marquise Natural Diamond

GD • I/SI1 • GIA 5553831752

Certificate GIA 5553831752

Diamond specifications and retailer prices

From $4,996 AUD
As of November 4, 2026
Save $3,957 AUD (44%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: $8,954 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 I colour (near-colourless) and SI1 clarity (slightly-included), with a standard cut grade stated by the retailer rather than the lab and certified by GIA 5553831752. Listed at 13 retailers as of November 4, 2026, with prices from $4,996 to $8,954, a $3,957 spread on the same certified stone. Helzberg Diamonds lists it at $8,954. Cut grade matters more than carat or clarity for visible brilliance. If you can shift budget toward an Excellent or Ideal cut, do it before chasing higher colour or clarity.

The 4Cs

1.20
Carat
I
Colour
SI1
Clarity
Good
Cut (retailer stated)

Specifications

Cut (retailer stated)Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle42.81°
Pavilion angle40.44°
OriginNatural
Grading LabGIA
CertificateGIA 5553831752
Dimensions10.07 × 5.44 × 3.66 mm
L/W Ratio1.85
Culet sizeNone
Top View
10.07 mm5.44 mm1.20 ctI / SI1
OriginNatural
CutGood
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 5553831752
Side View
Table 60.0%Crown 42.81°Girdle: MED-VTKPavilion 40.44°Culet: NoneDepth 67.3%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 4
Current: $8,954 AUD|Low: $4,996 AUD|High: $9,611 AUD|Avg: $6,607 AUD|-6.8%
Helzberg Diamonds
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
November 7, 2026
Retailer 9$4,996 AUD
Retailer 11$5,078 AUD
Retailer 7$5,119 AUD
Retailer 10$5,340 AUD
Retailer 4$5,455 AUD
Retailer 2$5,768 AUD
Retailer 8$6,308 AUD
Retailer 13$6,353 AUD
Retailer 3$6,420 AUD
Retailer 6$6,423 AUD
Retailer 12$8,428 AUD
Retailer 5$8,910 AUD
Helzberg Diamonds$8,954 AUD

33 data points across 13 retailers

13 retailers$4,996 AUD to $8,954 AUD

B+
Cheapest Retailer
-
$4,996 AUD
B+
Retailer 2
-
$5,078 AUD
View
B+
Retailer 3
-
$5,119 AUD
View
B+
Retailer 4
-
$5,340 AUD
View
B+
Retailer 5
-
$5,455 AUD
View
B
Retailer 6
-
$5,768 AUD
View
B
Retailer 7
-
$6,308 AUD
View
B
Retailer 8
-
$6,353 AUD
View
B
Retailer 9
-
$6,420 AUD
View
B
Retailer 10
-
$6,423 AUD
View
B
Retailer 11
-
$8,428 AUD
View
B
Retailer 12
-
$8,910 AUD
View
Most Expensive
B
Helzberg Diamonds
XZRLLLJOJHNLI · Nov 6
$8,954 AUD
$6,152 USD
View
12 more retailers have this diamond
Prices start from $4,996 AUDSave up to $3,957 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.

B+
1.20ct Marquise
$4,996 AUD