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Round|Natural|IGI

1.21ct J SI1 Round Natural Diamond

EX • J/SI1 • IGI 670478896

Shape and cutting style on the report: Round brilliant

Certificate IGI 670478896

Diamond specifications and retailer prices

From $3,186 NZD
As of November 5, 2026
Save $2,975 NZD (48%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: $8,706 NZD at NZ Jewellers · As of September 21, 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 SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI 670478896. Listed at 16 retailers as of November 4, 2026, with a 93% 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
J
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.4°
Pavilion angle40.8°
OriginNatural
Grading LabIGI
CertificateIGI 670478896
Dimensions6.86 × 6.91 × 4.19 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Cert comments
IDEAL CUT ROUND BRILLIANT
Top View
6.86 mm6.91 mm1.21 ctJ / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI 670478896
Side View
Table 58.0%Crown 34.4°Girdle: MediumPavilion 40.8°Culet: NoneDepth 60.9%

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 5
Current: $7,641 NZD|Low: $3,186 NZD|High: $8,706 NZD|Avg: $4,447 NZD|-12.2%
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
November 7, 2026
Retailer 7$3,186 NZD
Retailer 8$3,375 NZD
Retailer 9$3,568 NZD
Retailer 10$3,568 NZD
Retailer 6$3,599 NZD
Retailer 2$3,873 NZD
Retailer 4$4,302 NZD
Retailer 3$4,779 NZD
Retailer 5$6,160 NZD
NZ Jewellers$7,641 NZD

29 data points across 10 retailers

16 retailers$3,186 NZD to $6,160 NZD

A
Cheapest Retailer
-
$3,186 NZD
A
Retailer 2
-
$3,375 NZD
View
Retailer 3
-
$3,568 NZD
View
Price last confirmed 57 days ago
Retailer 4
-
$3,568 NZD
View
Price last confirmed 45 days ago
Retailer 5
-
$3,568 NZD
View
Price last confirmed 16 days ago
A
Retailer 6
-
$3,599 NZD
View
Retailer 7
-
$3,655 NZD
View
Price last confirmed 22 days ago
A
Retailer 8
-
$3,873 NZD
View
Retailer 9
-
$4,118 NZD
View
Price last confirmed 61 days ago
Retailer 10
-
$4,118 NZD
View
Price last confirmed 46 days ago
B+
Retailer 11
-
$4,302 NZD
View
B+
Retailer 12
-
$4,779 NZD
View
B
Retailer 13
-
$6,160 NZD
View
Retailer 14
-
$7,641 NZD
View
Price last confirmed 18 days ago
Retailer 15
-
$8,706 NZD
View
Price last confirmed 58 days ago
Most Expensive
NZ Jewellers
4037a78b-fd2d-45af-aade-16b6d7d538be · Sep 21
$8,706 NZD
$4,826 USD
View
Price last confirmed 46 days ago
15 more retailers have this diamond
Prices start from $3,186 NZDSave up to $2,975 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
$3,186 NZD