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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 $4,299 AUD
As of November 4, 2026
Save $4,138 AUD (49%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: $8,437 AUD 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 $4,299 to $8,437, a $4,138 spread on the same certified stone. NZ Jewellers lists it at $8,437. 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
Colour
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
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 4
Current: $4,522 AUD|Low: $4,470 AUD|High: $7,999 AUD|Avg: $5,526 AUD|-1.7%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
November 6, 2026
Retailer 6$4,470 AUD
Retailer 1$4,522 AUD
Retailer 7$5,028 AUD
Retailer 2$5,071 AUD
Retailer 3$5,308 AUD
Retailer 4$5,910 AUD
Retailer 5$7,882 AUD

39 data points across 7 retailers

14 retailers$4,299 AUD to $8,437 AUD

A
Cheapest Retailer
-
$4,299 AUD
A
Retailer 2
-
$4,470 AUD
View
Final sale: no returns
A
Retailer 3
-
$4,522 AUD
View
A
Retailer 4
-
$4,679 AUD
View
A
Retailer 5
-
$4,842 AUD
View
Retailer 6
-
$4,842 AUD
View
Price last confirmed 9 days ago
B+
Retailer 7
-
$5,028 AUD
View
B+
Retailer 8
-
$5,052 AUD
View
A
Retailer 9
-
$5,071 AUD
View
B+
Retailer 10
-
$5,308 AUD
View
B+
Retailer 11
-
$5,587 AUD
View
B+
Retailer 12
-
$5,910 AUD
View
B
Retailer 13
-
$7,882 AUD
View
Most Expensive
B
NZ Jewellers
8092b639-6918-494c-8177-29875da9e610 · Nov 5
$8,437 AUD
$5,797 USD
View
13 more retailers have this diamond
Prices start from $4,299 AUDSave up to $4,138 AUD

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
$4,299 AUD