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Round|Natural|GIA

1.21ct J SI1 Round Natural Diamond

EX • J/SI1 • GIA 2243122857

Certificate GIA 2243122857

Diamond specifications and retailer prices

From $3,187 AUD
As of November 6, 2026
Save $2,572 AUD (45%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: $5,759 AUD at Helzberg Diamonds · As of November 6, 2026
View at Helzberg Diamonds

About this 1.21ct natural round diamond

This 1.21ct natural round sits in the classic one-carat band, graded J colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 2243122857. Listed at 12 retailers as of November 6, 2026, with prices from $3,187 to $5,759, a $2,572 spread on the same certified stone. Helzberg Diamonds lists it at $5,759. 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

1.21
Carat
J
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceMedium
Crown angle34°
Pavilion angle41.4°
OriginNatural
Grading LabGIA
CertificateGIA 2243122857
Dimensions6.81 × 6.83 × 4.25 mm
L/W Ratio1.00
Culet sizeNone
Top View
6.81 mm6.83 mm1.21 ctJ / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceMedium
CertificateGIA 2243122857
Side View
Table 56.0%Crown 34°Girdle: MED-STKPavilion 41.4°Culet: NoneDepth 62.3%

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 6
Current: $5,759 AUD|Low: $3,187 AUD|High: $5,759 AUD|Avg: $4,190 AUD
Helzberg Diamonds
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
November 6, 2026
Retailer 2$3,187 AUD
Retailer 7$3,419 AUD
Retailer 3$3,481 AUD
Retailer 11$3,499 AUD
Retailer 8$3,609 AUD
Retailer 5$4,001 AUD
Retailer 10$4,005 AUD
Retailer 6$4,031 AUD
Retailer 9$4,106 AUD
Retailer 12$4,899 AUD
Retailer 4$5,238 AUD
Helzberg Diamonds$5,759 AUD

3 data points across 12 retailers

12 retailers$3,187 AUD to $5,759 AUD

A
Cheapest Retailer
-
$3,187 AUD
B+
Retailer 2
-
$3,419 AUD
View
B+
Retailer 3
-
$3,481 AUD
View
B+
Retailer 4
-
$3,499 AUD
View
B+
Retailer 5
-
$3,609 AUD
View
B
Retailer 6
-
$4,001 AUD
View
B
Retailer 7
-
$4,005 AUD
View
B+
Retailer 8
-
$4,031 AUD
View
B
Retailer 9
-
$4,106 AUD
View
B
Retailer 10
-
$4,899 AUD
View
B
Retailer 11
-
$5,238 AUD
View
Most Expensive
B
Helzberg Diamonds
XZRIIKJHIIOLN · Nov 6
$5,759 AUD
$3,957 USD
View
11 more retailers have this diamond
Prices start from $3,187 AUDSave up to $2,572 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 Round
$3,187 AUD