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Round|Natural|IGI

1.28ct I SI1 Round Natural Diamond

EX • I/SI1 • IGI 654416426

Shape and cutting style on the report: Round brilliant

Certificate IGI 654416426

Diamond specifications and retailer prices

From $4,126 CAD
As of November 4, 2026
Save $3,971 CAD (49%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: $8,096 CAD at NZ Jewellers · As of November 5, 2026
View at NZ Jewellers

About this 1.28ct natural round diamond

This 1.28ct natural round sits in the one-and-a-quarter to one-and-a-half carat band, graded I colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI 654416426. Listed at 14 retailers as of November 4, 2026, with prices from $4,126 to $8,096, a $3,971 spread on the same certified stone. NZ Jewellers lists it at $8,096. 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

1.28
Carat
I
Color
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33.8°
Pavilion angle41.1°
OriginNatural
Grading LabIGI
CertificateIGI 654416426
Dimensions6.98 × 7.01 × 4.25 mm
L/W Ratio1.00
Girdle conditionFaceted
Culet sizePointed
Cert comments
IDEAL CUT ROUND BRILLIANT
Top View
6.98 mm7.01 mm1.28 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI 654416426
Side View
Table 60.0%Crown 33.8°Girdle: MED-STKPavilion 41.1°Culet: NoneDepth 60.7%

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: $4,339 CAD|Low: $4,289 CAD|High: $7,676 CAD|Avg: $5,303 CAD|-1.7%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
November 6, 2026
Retailer 6$4,289 CAD
Retailer 1$4,339 CAD
Retailer 7$4,825 CAD
Retailer 2$4,866 CAD
Retailer 3$5,093 CAD
Retailer 4$5,672 CAD
Retailer 5$7,564 CAD

39 data points across 7 retailers

14 retailers$4,126 CAD to $8,096 CAD

A
Cheapest Retailer
-
$4,126 CAD
A
Retailer 2
-
$4,289 CAD
View
Final sale: no returns
A
Retailer 3
-
$4,339 CAD
View
A
Retailer 4
-
$4,490 CAD
View
A
Retailer 5
-
$4,646 CAD
View
Retailer 6
-
$4,646 CAD
View
Price last confirmed 8 days ago
B+
Retailer 7
-
$4,825 CAD
View
B+
Retailer 8
-
$4,848 CAD
View
A
Retailer 9
-
$4,866 CAD
View
B+
Retailer 10
-
$5,093 CAD
View
B+
Retailer 11
-
$5,362 CAD
View
B+
Retailer 12
-
$5,672 CAD
View
B
Retailer 13
-
$7,564 CAD
View
Most Expensive
B
NZ Jewellers
8092b639-6918-494c-8177-29875da9e610 · Nov 5
$8,096 CAD
$5,797 USD
View
13 more retailers have this diamond
Prices start from $4,126 CADSave up to $3,971 CAD

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
1.28ct Round
$4,126 CAD