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Marquise|Natural|GIA

1.21ct J SI1 Marquise Natural Diamond

GD • J/SI1 • GIA 2554338825

Certificate GIA 2554338825

Diamond specifications and retailer prices

From $3,762 AUD
As of October 31, 2026
Save $3,250 AUD (46%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: $7,012 AUD at Helzberg Diamonds · As of November 3, 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 J 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 2554338825. Listed at 14 retailers as of October 31, 2026, with prices from $3,762 to $7,012, a $3,250 spread on the same certified stone. Helzberg Diamonds lists it at $7,012. 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
J
Colour
SI1
Clarity
Good
Cut (retailer stated)

Specifications

Cut (retailer stated)Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle43.87°
Pavilion angle39.78°
OriginNatural
Grading LabGIA
CertificateGIA 2554338825
Dimensions9.83 × 5.39 × 3.60 mm
L/W Ratio1.82
Culet sizeNone
Top View
9.83 mm5.39 mm1.21 ctJ / SI1
OriginNatural
CutGood
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 2554338825
Side View
Table 59.0%Crown 43.87°Girdle: STK-VTKPavilion 39.78°Culet: NoneDepth 66.6%

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: Oct 31
Current: $7,012 AUD|Low: $3,762 AUD|High: $7,452 AUD|Avg: $5,037 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
Retailer 12
Retailer 13
November 5, 2026
Retailer 4$3,762 AUD
Retailer 2$3,854 AUD
Retailer 9$4,047 AUD
Retailer 5$4,093 AUD
Retailer 6$4,359 AUD
Retailer 13$4,442 AUD
Retailer 11$4,764 AUD
Retailer 3$4,822 AUD
Retailer 12$4,909 AUD
Retailer 8$4,916 AUD
Retailer 7$6,220 AUD
Retailer 10$6,622 AUD
Helzberg Diamonds$7,012 AUD

40 data points across 13 retailers

14 retailers$3,762 AUD to $7,012 AUD

B+
Cheapest Retailer
-
$3,762 AUD
B+
Retailer 2
-
$3,854 AUD
View
B+
Retailer 3
-
$4,047 AUD
View
B+
Retailer 4
-
$4,093 AUD
View
B+
Retailer 5
-
$4,359 AUD
View
B
Retailer 6
-
$4,442 AUD
View
B
Retailer 7
-
$4,764 AUD
View
B
Retailer 8
-
$4,822 AUD
View
B
Retailer 9
-
$4,909 AUD
View
B
Retailer 10
-
$4,916 AUD
View
B
Retailer 11
-
$5,335 AUD
View
B
Retailer 12
-
$6,220 AUD
View
B
Retailer 13
-
$6,622 AUD
View
Most Expensive
B
Helzberg Diamonds
XZRILLKJJOOIL · Nov 3
$7,012 AUD
$4,818 USD
View
13 more retailers have this diamond
Prices start from $3,762 AUDSave up to $3,250 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+
1.21ct Marquise
$3,762 AUD