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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 $2,234 AUD
As of November 4, 2026
Save $2,265 AUD (50%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: $6,491 AUD 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: $3,752 AUD|Low: $1,955 AUD|High: $4,822 AUD|Avg: $3,129 AUD|-5.7%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
November 6, 2026
Retailer 8$1,955 AUD
Retailer 6$2,234 AUD
Retailer 7$2,473 AUD
Retailer 4$2,512 AUD
Retailer 9$2,662 AUD
Retailer 2$2,873 AUD
Retailer 3$3,244 AUD
Retailer 1$3,752 AUD
Retailer 5$4,499 AUD

38 data points across 9 retailers

12 retailers$2,234 AUD to $4,499 AUD

Retailer 1
-
$1,955 AUD
Price last confirmed 8 days ago
A
Retailer 2
-
$2,234 AUD
View
A
Retailer 3
-
$2,473 AUD
View
A
Retailer 4
-
$2,512 AUD
View
Retailer 5
-
$2,662 AUD
View
Price last confirmed 34 days ago
Retailer 6
-
$2,826 AUD
View
Price last confirmed 38 days ago
B+
Retailer 7
-
$2,854 AUD
View
A
Retailer 8
-
$2,873 AUD
View
B+
Retailer 9
-
$3,244 AUD
View
B+
Retailer 10
-
$3,752 AUD
View
B
Retailer 11
-
$4,499 AUD
View
Most Expensive
NZ Jewellers
290c573a-1e51-4b3a-b4f0-ba1d7f352c8f · Oct 3
$6,491 AUD
$4,460 USD
View
Price last confirmed 34 days ago
11 more retailers have this diamond
Prices start from $2,234 AUDSave up to $2,265 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
1.23ct Round
$2,234 AUD