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Round|Natural|GIA

1.21ct J SI2 Round Natural Diamond

GD • J/SI2 • GIA 17427766

Certificate GIA 17427766

Diamond specifications and retailer prices

From $3,417 AUD
$2,400 USD
As of October 30, 2026
Save $3,269 AUD (49%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: $7,978 AUD at NZ Jewellers · As of September 28, 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 J colour (near-colourless) and SI2 clarity (slightly-included), with a standard cut grade and certified by GIA 17427766. Listed at 11 retailers as of October 30, 2026, with a 96% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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
SI2
Clarity
Good
Cut

Specifications

CutGood
PolishVery Good
SymmetryVery Good
FluorescenceStrong
Crown angle33°
Pavilion angle40.2°
OriginNatural
Grading LabGIA
CertificateGIA 17427766
Dimensions6.91 × 6.94 × 4.04 mm
L/W Ratio1.00
Star length50%
Lower girdle85%
Key to symbols
Feather, Crystal, Knot
Top View
6.91 mm6.94 mm1.21 ctJ / SI2
OriginNatural
CutGood
PolishVery Good
SymmetryVery Good
FluorescenceStrong
CertificateGIA 17427766
Side View
Table 63.0%Crown 33°Girdle: STK-THKPavilion 40.2°Culet: NoneDepth 58.3%

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 30
Current: $3,672 AUD|Low: $2,935 AUD|High: $6,765 AUD|Avg: $4,389 AUD|-1.3%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
November 1, 2026
Retailer 5$2,935 AUD
Retailer 1$3,672 AUD
Retailer 4$4,055 AUD
Retailer 2$4,456 AUD
Retailer 3$6,686 AUD

40 data points across 5 retailers

11 retailers$3,417 AUD to $6,686 AUD

B+
Cheapest Retailer
-
$3,417 AUD
$2,400 USD
B
Retailer 2
-
$3,672 AUD
£2,031 GBP
View
B
Retailer 3
-
$3,690 AUD
View
Retailer 4
-
$3,817 AUD
$2,681 USD
View
Price last confirmed 33 days ago
Retailer 5
-
$3,963 AUD
$2,784 USD
View
Price last confirmed 33 days ago
B
Retailer 6
-
$4,055 AUD
£2,243 GBP
View
Retailer 7
-
$4,403 AUD
$3,093 USD
View
Price last confirmed 32 days ago
B
Retailer 8
-
$4,456 AUD
€2,981 EUR
View
C
Retailer 9
-
$5,197 AUD
€3,477 EUR
View
C
Retailer 10
-
$6,686 AUD
£3,698 GBP
View
Most Expensive
NZ Jewellers
0d78096f-79e7-4b7b-a025-93a553bf2cb8 · Sep 28
$7,978 AUD
$5,604 USD
View
Price last confirmed 34 days ago
10 more retailers have this diamond
Prices start from $3,417 AUDSave up to $3,269 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 Round
$3,417 AUD