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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 $2,954 USD
As of November 4, 2026
Save $2,843 USD (49%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: $5,797 USD 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 $2,954 to $5,797, a $2,843 spread on the same certified stone. NZ Jewellers lists it at $5,797. 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: $3,107 USD|Low: $3,071 USD|High: $5,496 USD|Avg: $3,797 USD|-1.7%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
November 6, 2026
Retailer 6$3,071 USD
Retailer 1$3,107 USD
Retailer 7$3,455 USD
Retailer 2$3,484 USD
Retailer 3$3,647 USD
Retailer 4$4,061 USD
Retailer 5$5,416 USD

39 data points across 7 retailers

14 retailers$2,954 USD to $5,797 USD

A
Cheapest Retailer
-
$2,954 USD
A
Retailer 2
-
$3,071 USD
View
Final sale: no returns
A
Retailer 3
-
$3,107 USD
View
A
Retailer 4
-
$3,215 USD
View
A
Retailer 5
-
$3,327 USD
View
Retailer 6
-
$3,327 USD
View
Price last confirmed 8 days ago
B+
Retailer 7
-
$3,455 USD
View
B+
Retailer 8
-
$3,471 USD
View
A
Retailer 9
-
$3,484 USD
View
B+
Retailer 10
-
$3,647 USD
View
B+
Retailer 11
-
$3,839 USD
View
B+
Retailer 12
-
$4,061 USD
View
B
Retailer 13
-
$5,416 USD
View
Most Expensive
B
NZ Jewellers
8092b639-6918-494c-8177-29875da9e610 · Nov 5
$5,797 USD
View
13 more retailers have this diamond
Prices start from $2,954 USDSave up to $2,843 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
1.28ct Round
$2,954 USD