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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 $2,809 USD
As of November 4, 2026
Save $2,658 USD (49%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: $5,467 USD 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 $2,809 to $5,467, a $2,658 spread on the same certified stone. NZ Jewellers lists it at $5,467. 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
Color
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: $2,930 USD|Low: $2,809 USD|High: $5,184 USD|Avg: $3,473 USD|-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$2,809 USD
Retailer 6$2,825 USD
Retailer 8$2,897 USD
Retailer 1$2,930 USD
Retailer 9$3,258 USD
Retailer 2$3,286 USD
Retailer 3$3,437 USD
Retailer 4$3,829 USD
Retailer 5$5,107 USD

39 data points across 9 retailers

15 retailers$2,809 USD to $5,467 USD

A
Cheapest Retailer
-
$2,809 USD
A
Retailer 2
-
$2,810 USD
View
A
Retailer 3
-
$2,825 USD
View
B+
Retailer 4
-
$2,897 USD
View
Final sale: no returns
A
Retailer 5
-
$2,930 USD
View
Retailer 6
-
$3,138 USD
View
Price last confirmed 8 days ago
B+
Retailer 7
-
$3,138 USD
View
B+
Retailer 8
-
$3,258 USD
View
B+
Retailer 9
-
$3,280 USD
View
B+
Retailer 10
-
$3,286 USD
View
B+
Retailer 11
-
$3,437 USD
View
B
Retailer 12
-
$3,620 USD
View
B
Retailer 13
-
$3,829 USD
View
B
Retailer 14
-
$5,107 USD
View
Most Expensive
B
NZ Jewellers
a8a486c7-4ee6-4846-b6b0-a328558e00b8 · Nov 5
$5,467 USD
View
14 more retailers have this diamond
Prices start from $2,809 USDSave up to $2,658 USD

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
$2,809 USD