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1.21ct H SI1 Round Natural Diamond

EX • H/SI1 • IGI 639424846

Shape and cutting style on the report: Round brilliant

Certificate IGI 639424846

Diamond specifications and retailer prices

From $5,067 NZD
As of November 4, 2026
Save $4,795 NZD (49%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: $9,862 NZD at NZ Jewellers · As of November 5, 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 H colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI 639424846. Listed at 15 retailers as of November 4, 2026, with prices from $5,067 to $9,862, a $4,795 spread on the same certified stone. NZ Jewellers lists it at $9,862. 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
H
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.6°
Pavilion angle41.3°
OriginNatural
Grading LabIGI
CertificateIGI 639424846
Dimensions6.87 × 6.83 × 4.19 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Cert comments
IDEAL CUT ROUND BRILLIANT
Top View
6.87 mm6.83 mm1.21 ctH / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI 639424846
Side View
Table 60.0%Crown 34.6°Girdle: MediumPavilion 41.3°Culet: NoneDepth 61.1%

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 4
Current: $5,285 NZD|Low: $5,067 NZD|High: $9,351 NZD|Avg: $6,266 NZD|-1.7%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
November 6, 2026
Retailer 7$5,067 NZD
Retailer 6$5,096 NZD
Retailer 8$5,226 NZD
Retailer 1$5,285 NZD
Retailer 9$5,877 NZD
Retailer 2$5,928 NZD
Retailer 3$6,200 NZD
Retailer 4$6,907 NZD
Retailer 5$9,213 NZD

39 data points across 9 retailers

15 retailers$5,067 NZD to $9,862 NZD

A
Cheapest Retailer
-
$5,067 NZD
A
Retailer 2
-
$5,069 NZD
View
A
Retailer 3
-
$5,096 NZD
View
B+
Retailer 4
-
$5,226 NZD
View
Final sale: no returns
A
Retailer 5
-
$5,285 NZD
View
Retailer 6
-
$5,661 NZD
View
Price last confirmed 9 days ago
B+
Retailer 7
-
$5,661 NZD
View
B+
Retailer 8
-
$5,877 NZD
View
B+
Retailer 9
-
$5,917 NZD
View
B+
Retailer 10
-
$5,928 NZD
View
B+
Retailer 11
-
$6,200 NZD
View
B
Retailer 12
-
$6,530 NZD
View
B
Retailer 13
-
$6,907 NZD
View
B
Retailer 14
-
$9,213 NZD
View
Most Expensive
B
NZ Jewellers
a8a486c7-4ee6-4846-b6b0-a328558e00b8 · Nov 5
$9,862 NZD
$5,467 USD
View
14 more retailers have this diamond
Prices start from $5,067 NZDSave up to $4,795 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
$5,067 NZD