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Round|Natural|GIA

1.21ct H SI1 Round Natural Diamond

EX • H/SI1 • GIA 1563314290

Certificate GIA 1563314290

Diamond specifications and retailer prices

From $4,391 AUD
As of October 31, 2026
Save $3,962 AUD (47%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: $8,353 AUD at Helzberg Diamonds · As of November 1, 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 H colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 1563314290. Listed at 15 retailers as of October 31, 2026, with prices from $4,391 to $8,353, a $3,962 spread on the same certified stone. Helzberg Diamonds lists it at $8,353. 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
H
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33°
Pavilion angle41.4°
OriginNatural
Grading LabGIA
CertificateGIA 1563314290
Dimensions6.85 × 6.89 × 4.20 mm
L/W Ratio1.01
Culet sizeNone
Top View
6.85 mm6.89 mm1.21 ctH / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 1563314290
Side View
Table 58.0%Crown 33°Girdle: MED-STKPavilion 41.4°Culet: NoneDepth 61.2%

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: Oct 31
Current: $8,353 AUD|Low: $4,391 AUD|High: $8,670 AUD|Avg: $5,937 AUD|-3.7%
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
Retailer 15
Retailer 16
November 2, 2026
Retailer 12$4,391 AUD
Retailer 8$4,643 AUD
Retailer 14$4,675 AUD
Retailer 4$4,733 AUD
Retailer 11$4,788 AUD
Retailer 2$5,140 AUD
Retailer 3$5,283 AUD
Retailer 6$5,289 AUD
Retailer 13$5,619 AUD
Retailer 5$5,721 AUD
Retailer 9$5,846 AUD
Retailer 16$6,043 AUD
Retailer 10$6,092 AUD
Retailer 15$7,407 AUD
Retailer 7$8,034 AUD
Helzberg Diamonds$8,353 AUD

34 data points across 16 retailers

15 retailers$4,391 AUD to $8,353 AUD

A
Cheapest Retailer
-
$4,391 AUD
B+
Retailer 2
-
$4,675 AUD
View
B+
Retailer 3
-
$4,733 AUD
View
B+
Retailer 4
-
$4,788 AUD
View
B+
Retailer 5
-
$5,140 AUD
View
B+
Retailer 6
-
$5,283 AUD
View
B+
Retailer 7
-
$5,289 AUD
View
B+
Retailer 8
-
$5,619 AUD
View
B+
Retailer 9
-
$5,721 AUD
View
B+
Retailer 10
-
$5,846 AUD
View
B+
Retailer 11
-
$6,043 AUD
View
B+
Retailer 12
-
$6,092 AUD
View
B
Retailer 13
-
$7,407 AUD
View
Retailer 14
-
$8,034 AUD
View
Price last confirmed 17 days ago
Most Expensive
B
Helzberg Diamonds
XZRHLMJJHKIPG · Nov 1
$8,353 AUD
$5,739 USD
View
14 more retailers have this diamond
Prices start from $4,391 AUDSave up to $3,962 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
$4,391 AUD