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Marquise|Natural|GIA

1.21ct I SI2 Marquise Natural Diamond

GD • I/SI2 • GIA 6551273825

Certificate GIA 6551273825

Diamond specifications and retailer prices

From $3,791 AUD
As of November 5, 2026
Save $3,109 AUD (45%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: $6,900 AUD at Helzberg Diamonds · As of November 6, 2026
View at Helzberg Diamonds

About this 1.21ct natural marquise diamond

This 1.21ct natural marquise sits in the classic one-carat band, graded I colour (near-colourless) and SI2 clarity (slightly-included), with a standard cut grade stated by the retailer rather than the lab and certified by GIA 6551273825. Listed at 12 retailers as of November 5, 2026, with prices from $3,791 to $6,900, a $3,109 spread on the same certified stone. Helzberg Diamonds lists it at $6,900. 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

1.21
Carat
I
Colour
SI2
Clarity
Good
Cut (retailer stated)

Specifications

Cut (retailer stated)Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle43.52°
Pavilion angle37.98°
OriginNatural
Grading LabGIA
CertificateGIA 6551273825
Dimensions9.85 × 5.41 × 3.52 mm
L/W Ratio1.82
Culet sizeNone
Top View
9.85 mm5.41 mm1.21 ctI / SI2
OriginNatural
CutGood
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6551273825
Side View
Table 60.0%Crown 43.52°Girdle: MED-VTKPavilion 37.98°Culet: NoneDepth 65.1%

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 5
Current: $6,900 AUD|Low: $3,701 AUD|High: $7,479 AUD|Avg: $5,083 AUD|-7.7%
Helzberg Diamonds
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 7, 2026
Retailer 7$3,791 AUD
Retailer 4$3,946 AUD
Retailer 8$4,013 AUD
Retailer 2$4,276 AUD
Retailer 3$4,369 AUD
Retailer 5$4,422 AUD
Retailer 10$4,691 AUD
Retailer 6$4,823 AUD
Retailer 11$4,839 AUD
Retailer 9$6,509 AUD
Helzberg Diamonds$6,900 AUD

44 data points across 11 retailers

12 retailers$3,791 AUD to $6,900 AUD

A
Cheapest Retailer
-
$3,791 AUD
A
Retailer 2
-
$3,946 AUD
View
B+
Retailer 3
-
$4,013 AUD
View
B+
Retailer 4
-
$4,276 AUD
View
B+
Retailer 5
-
$4,369 AUD
View
B+
Retailer 6
-
$4,422 AUD
View
B+
Retailer 7
-
$4,691 AUD
View
B+
Retailer 8
-
$4,823 AUD
View
B+
Retailer 9
-
$4,839 AUD
View
B
Retailer 10
-
$5,250 AUD
View
B
Retailer 11
-
$6,509 AUD
View
Most Expensive
B
Helzberg Diamonds
XZRMLLHINJOIL · Nov 6
$6,900 AUD
$4,741 USD
View
11 more retailers have this diamond
Prices start from $3,791 AUDSave up to $3,109 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
1.21ct Marquise
$3,791 AUD