CaratHunter
Plans
Round|Natural|IGI

1.23ct J SI2 Round Natural Diamond

EX • J/SI2 • IGI 828654309

Shape and cutting style on the report: Round brilliant

Certificate IGI 828654309

Diamond specifications and retailer prices

From HK$12,030 HKD
As of November 4, 2026
Save HK$12,195 HKD (50%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: HK$34,955 HKD at NZ Jewellers · As of October 3, 2026
View at NZ Jewellers

About this 1.23ct natural round diamond

This 1.23ct natural round sits in the classic one-carat band, graded J colour (near-colourless) and SI2 clarity (slightly-included), with a top-tier cut grade and certified by IGI 828654309. Listed at 12 retailers as of November 4, 2026, with a 101% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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

1.23
Carat
J
Colour
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.4°
Pavilion angle40.2°
OriginNatural
Grading LabIGI
CertificateIGI 828654309
Dimensions6.82 × 6.78 × 4.22 mm
L/W Ratio1.01
Girdle conditionFaceted
Top View
6.82 mm6.78 mm1.23 ctJ / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI 828654309
Side View
Table 58.0%Crown 36.4°Girdle: Slightly ThickPavilion 40.2°Culet: NoneDepth 62.1%

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$20,205 HKD|Low: HK$10,526 HKD|High: HK$25,965 HKD|Avg: HK$16,850 HKD|-5.7%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
November 6, 2026
Retailer 8HK$10,526 HKD
Retailer 6HK$12,030 HKD
Retailer 7HK$13,316 HKD
Retailer 4HK$13,527 HKD
Retailer 9HK$14,335 HKD
Retailer 2HK$15,471 HKD
Retailer 3HK$17,470 HKD
Retailer 1HK$20,205 HKD
Retailer 5HK$24,225 HKD

38 data points across 9 retailers

12 retailersHK$12,030 HKD to HK$24,225 HKD

Retailer 1
-
HK$10,526 HKD
Price last confirmed 8 days ago
A
Retailer 2
-
HK$12,030 HKD
View
A
Retailer 3
-
HK$13,316 HKD
View
A
Retailer 4
-
HK$13,527 HKD
View
Retailer 5
-
HK$14,335 HKD
View
Price last confirmed 34 days ago
Retailer 6
-
HK$15,220 HKD
View
Price last confirmed 38 days ago
B+
Retailer 7
-
HK$15,369 HKD
View
A
Retailer 8
-
HK$15,471 HKD
View
B+
Retailer 9
-
HK$17,470 HKD
View
B+
Retailer 10
-
HK$20,205 HKD
View
B
Retailer 11
-
HK$24,225 HKD
View
Most Expensive
NZ Jewellers
290c573a-1e51-4b3a-b4f0-ba1d7f352c8f · Oct 3
HK$34,955 HKD
$4,460 USD
View
Price last confirmed 34 days ago
11 more retailers have this diamond
Prices start from HK$12,030 HKDSave up to HK$12,195 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
1.23ct Round
HK$12,030 HKD