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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 $4,329 NZD
As of November 5, 2026
Save $4,118 NZD (49%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: $10,109 NZD 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 November 4, 2026, with a 95% 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: Nov 5
Current: $4,627 NZD|Low: $4,623 NZD|High: $8,572 NZD|Avg: $6,075 NZD|-1.8%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
November 6, 2026
Retailer 1$4,627 NZD
Retailer 2$5,087 NZD
Retailer 3$5,616 NZD
Retailer 4$8,448 NZD

41 data points across 4 retailers

11 retailers$4,329 NZD to $8,448 NZD

B+
Cheapest Retailer
-
$4,329 NZD
B
Retailer 2
-
$4,627 NZD
View
B
Retailer 3
-
$4,676 NZD
View
Retailer 4
-
$4,836 NZD
View
Price last confirmed 39 days ago
Retailer 5
-
$5,022 NZD
View
Price last confirmed 38 days ago
B
Retailer 6
-
$5,087 NZD
View
Retailer 7
-
$5,579 NZD
View
Price last confirmed 38 days ago
B
Retailer 8
-
$5,616 NZD
View
C
Retailer 9
-
$6,584 NZD
View
C
Retailer 10
-
$8,448 NZD
View
Most Expensive
NZ Jewellers
0d78096f-79e7-4b7b-a025-93a553bf2cb8 · Sep 28
$10,109 NZD
$5,604 USD
View
Price last confirmed 39 days ago
10 more retailers have this diamond
Prices start from $4,329 NZDSave up to $4,118 NZD

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
$4,329 NZD