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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 $3,951 NZD
As of November 6, 2026
Save $3,187 NZD (45%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: $7,138 NZD 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 $3,951 to $7,138, a $3,187 spread on the same certified stone. Helzberg Diamonds lists it at $7,138. 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: $7,138 NZD|Low: $3,951 NZD|High: $7,138 NZD|Avg: $5,159 NZD
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 7, 2026
Retailer 5$3,951 NZD
Retailer 2$4,237 NZD
Retailer 3$4,315 NZD
Retailer 11$4,337 NZD
Retailer 8$4,474 NZD
Retailer 6$4,959 NZD
Retailer 10$4,964 NZD
Retailer 7$4,997 NZD
Retailer 9$5,089 NZD
Retailer 12$6,072 NZD
Retailer 4$6,492 NZD
Helzberg Diamonds$7,138 NZD

4 data points across 12 retailers

12 retailers$3,951 NZD to $7,138 NZD

A
Cheapest Retailer
-
$3,951 NZD
B+
Retailer 2
-
$4,237 NZD
View
B+
Retailer 3
-
$4,315 NZD
View
B+
Retailer 4
-
$4,337 NZD
View
B+
Retailer 5
-
$4,474 NZD
View
B
Retailer 6
-
$4,959 NZD
View
B
Retailer 7
-
$4,964 NZD
View
B+
Retailer 8
-
$4,997 NZD
View
B
Retailer 9
-
$5,089 NZD
View
B
Retailer 10
-
$6,072 NZD
View
B
Retailer 11
-
$6,492 NZD
View
Most Expensive
B
Helzberg Diamonds
XZRIIKJHIIOLN · Nov 6
$7,138 NZD
$3,957 USD
View
11 more retailers have this diamond
Prices start from $3,951 NZDSave up to $3,187 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.

A
1.21ct Round
$3,951 NZD