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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 HK$23,152 HKD
As of November 4, 2026
Save HK$22,282 HKD (49%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: HK$45,433 HKD 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 HK$23,152 to HK$45,433, a HK$22,282 spread on the same certified stone. NZ Jewellers lists it at HK$45,433. 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: HK$27,306 HKD|Low: HK$24,069 HKD|High: HK$43,074 HKD|Avg: HK$29,756 HKD|-0.2%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
November 7, 2026
Retailer 6HK$24,069 HKD
Retailer 2HK$24,351 HKD
Retailer 7HK$27,078 HKD
Retailer 1HK$27,306 HKD
Retailer 3HK$28,583 HKD
Retailer 4HK$31,828 HKD
Retailer 5HK$42,447 HKD

40 data points across 7 retailers

14 retailersHK$23,152 HKD to HK$45,433 HKD

A
Cheapest Retailer
-
HK$23,152 HKD
A
Retailer 2
-
HK$24,069 HKD
View
Final sale: no returns
A
Retailer 3
-
HK$24,351 HKD
View
A
Retailer 4
-
HK$25,197 HKD
View
A
Retailer 5
-
HK$26,075 HKD
View
Retailer 6
-
HK$26,075 HKD
View
Price last confirmed 9 days ago
B+
Retailer 7
-
HK$27,078 HKD
View
B+
Retailer 8
-
HK$27,204 HKD
View
A
Retailer 9
-
HK$27,306 HKD
View
B+
Retailer 10
-
HK$28,583 HKD
View
B+
Retailer 11
-
HK$30,088 HKD
View
B+
Retailer 12
-
HK$31,828 HKD
View
B
Retailer 13
-
HK$42,447 HKD
View
Most Expensive
B
NZ Jewellers
8092b639-6918-494c-8177-29875da9e610 · Nov 5
HK$45,433 HKD
$5,797 USD
View
13 more retailers have this diamond
Prices start from HK$23,152 HKDSave up to HK$22,282 HKD

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
HK$23,152 HKD