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Round|Natural|GIA

1.21ct I SI2 Round Natural Diamond

EX • I/SI2 • GIA 6431629525

Certificate GIA 6431629525

Diamond specifications and retailer prices

From $4,091 AUD
As of November 1, 2026
Save $4,343 AUD (51%) vs most expensive(unlock to see where)
23 retailers carry this diamond
Most expensive: $8,786 AUD at NZ Jewellers · As of October 17, 2026
View at NZ Jewellers

About this 1.21ct natural round diamond

This 1.21ct natural round sits in the classic one-carat band, graded I colour (near-colourless) and SI2 clarity (slightly-included), with a top-tier cut grade and certified by GIA 6431629525. Listed at 23 retailers as of November 1, 2026, with a 106% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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
I
Colour
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
Crown angle35.5°
Pavilion angle40.8°
OriginNatural
Grading LabGIA
CertificateGIA 6431629525
Dimensions6.84 × 6.80 × 4.23 mm
L/W Ratio1.01
Top View
6.84 mm6.80 mm1.21 ctI / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 6431629525
Side View
Table 56.0%Crown 35.5°Girdle: MediumPavilion 40.8°Culet: NoneDepth 62.1%

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 1
Current: $7,353 AUD|Low: $4,091 AUD|High: $8,708 AUD|Avg: $5,573 AUD|-2.9%
Retailer 1
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
Retailer 17
Retailer 18
November 3, 2026
Retailer 15$4,091 AUD
Retailer 13$4,148 AUD
Retailer 16$4,186 AUD
Retailer 7$4,307 AUD
Retailer 9$4,598 AUD
Retailer 4$4,782 AUD
Retailer 3$4,999 AUD
Retailer 6$5,043 AUD
Retailer 17$5,196 AUD
Retailer 18$5,196 AUD
Retailer 12$5,238 AUD
Retailer 5$5,315 AUD
Retailer 2$5,370 AUD
Retailer 11$5,589 AUD
Retailer 8$6,001 AUD
Retailer 1$7,353 AUD
Retailer 14$8,434 AUD
Retailer 10$8,708 AUD

22 data points across 18 retailers

23 retailers$4,091 AUD to $8,434 AUD

A
Cheapest Retailer
-
$4,091 AUD
A
Retailer 2
-
$4,148 AUD
View
A
Retailer 3
-
$4,186 AUD
View
Retailer 4
-
$4,307 AUD
View
Price last confirmed 18 days ago
B+
Retailer 5
-
$4,598 AUD
View
B+
Retailer 6
-
$4,782 AUD
View
B+
Retailer 7
-
$4,999 AUD
View
Retailer 8
-
$5,043 AUD
View
Price last confirmed 56 days ago
Retailer 9
-
$5,043 AUD
View
Price last confirmed 21 days ago
Retailer 10
-
$5,043 AUD
View
Price last confirmed 19 days ago
B+
Retailer 11
-
$5,196 AUD
View
B+
Retailer 12
-
$5,196 AUD
View
Retailer 13
-
$5,237 AUD
View
Price last confirmed 22 days ago
B+
Retailer 14
-
$5,238 AUD
View
B+
Retailer 15
-
$5,315 AUD
View
B
Retailer 16
-
$5,370 AUD
View
B
Retailer 17
-
$5,589 AUD
View
Retailer 18
-
$5,819 AUD
View
Price last confirmed 60 days ago
Retailer 19
-
$5,819 AUD
View
Price last confirmed 19 days ago
B
Retailer 20
-
$7,353 AUD
View
B
Retailer 21
-
$8,434 AUD
View
Retailer 22
-
$8,786 AUD
View
Price last confirmed 57 days ago
Most Expensive
NZ Jewellers
ed3d6f6b-3ec0-4861-8c13-5b12bee53f86 · Oct 17
$8,786 AUD
$6,037 USD
View
Price last confirmed 20 days ago
22 more retailers have this diamond
Prices start from $4,091 AUDSave up to $4,343 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
$4,091 AUD