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Marquise|Natural|GIA

1.20ct I SI1 Marquise Natural Diamond

VG • I/SI1 • GIA 5241054637

Certificate GIA 5241054637

Diamond specifications and retailer prices

From $5,349 AUD
As of November 4, 2026
Save $4,235 AUD (44%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: $9,584 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 very-good cut grade stated by the retailer rather than the lab and certified by GIA 5241054637. Listed at 14 retailers as of November 4, 2026, with prices from $5,349 to $9,584, a $4,235 spread on the same certified stone. Helzberg Diamonds lists it at $9,584. 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
Very Good
Cut (retailer stated)

Specifications

Cut (retailer stated)Very Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle40.62°
Pavilion angle40.02°
OriginNatural
Grading LabGIA
CertificateGIA 5241054637
Dimensions10.10 × 5.46 × 3.58 mm
L/W Ratio1.85
Culet sizeNone
Top View
10.10 mm5.46 mm1.20 ctI / SI1
OriginNatural
CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 5241054637
Side View
Table 59.0%Crown 40.62°Girdle: STK-VTKPavilion 40.02°Culet: NDepth 65.6%

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: $9,584 AUD|Low: $5,349 AUD|High: $10,328 AUD|Avg: $6,907 AUD|-6.0%
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
Retailer 14
November 6, 2026
Retailer 10$5,349 AUD
Retailer 12$5,433 AUD
Retailer 6$5,593 AUD
Retailer 9$5,708 AUD
Retailer 8$5,717 AUD
Retailer 4$5,841 AUD
Retailer 5$5,880 AUD
Retailer 7$6,135 AUD
Retailer 14$6,776 AUD
Retailer 3$6,826 AUD
Retailer 2$6,878 AUD
Retailer 11$9,022 AUD
Retailer 13$9,521 AUD
Helzberg Diamonds$9,584 AUD

35 data points across 14 retailers

14 retailers$5,349 AUD to $9,584 AUD

B+
Cheapest Retailer
-
$5,349 AUD
B+
Retailer 2
-
$5,433 AUD
View
B+
Retailer 3
-
$5,593 AUD
View
B+
Retailer 4
-
$5,708 AUD
View
B+
Retailer 5
-
$5,717 AUD
View
B+
Retailer 6
-
$5,841 AUD
View
B+
Retailer 7
-
$5,880 AUD
View
B
Retailer 8
-
$6,135 AUD
View
B
Retailer 9
-
$6,776 AUD
View
B
Retailer 10
-
$6,826 AUD
View
B
Retailer 11
-
$6,878 AUD
View
B
Retailer 12
-
$9,022 AUD
View
B
Retailer 13
-
$9,521 AUD
View
Most Expensive
B
Helzberg Diamonds
XZRLIKHGLKMJN · Nov 6
$9,584 AUD
$6,585 USD
View
13 more retailers have this diamond
Prices start from $5,349 AUDSave up to $4,235 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
$5,349 AUD