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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 $3,600 SGD
As of November 4, 2026
Save $3,406 SGD (49%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: $7,007 SGD 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 $3,600 to $7,007, a $3,406 spread on the same certified stone. NZ Jewellers lists it at $7,007. 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
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 4
Current: $3,755 SGD|Low: $3,600 SGD|High: $6,644 SGD|Avg: $4,452 SGD|-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$3,600 SGD
Retailer 6$3,621 SGD
Retailer 8$3,713 SGD
Retailer 1$3,755 SGD
Retailer 9$4,175 SGD
Retailer 2$4,211 SGD
Retailer 3$4,405 SGD
Retailer 4$4,907 SGD
Retailer 5$6,545 SGD

39 data points across 9 retailers

15 retailers$3,600 SGD to $7,007 SGD

A
Cheapest Retailer
-
$3,600 SGD
A
Retailer 2
-
$3,601 SGD
View
A
Retailer 3
-
$3,621 SGD
View
B+
Retailer 4
-
$3,713 SGD
View
Final sale: no returns
A
Retailer 5
-
$3,755 SGD
View
Retailer 6
-
$4,022 SGD
View
Price last confirmed 8 days ago
B+
Retailer 7
-
$4,022 SGD
View
B+
Retailer 8
-
$4,175 SGD
View
B+
Retailer 9
-
$4,204 SGD
View
B+
Retailer 10
-
$4,211 SGD
View
B+
Retailer 11
-
$4,405 SGD
View
B
Retailer 12
-
$4,639 SGD
View
B
Retailer 13
-
$4,907 SGD
View
B
Retailer 14
-
$6,545 SGD
View
Most Expensive
B
NZ Jewellers
a8a486c7-4ee6-4846-b6b0-a328558e00b8 · Nov 5
$7,007 SGD
$5,467 USD
View
14 more retailers have this diamond
Prices start from $3,600 SGDSave up to $3,406 SGD

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
$3,600 SGD