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Radiant|Natural|GIA

1.23ct J SI1 Radiant Natural Diamond

ID • J/SI1 • GIA 2556124890

Certificate GIA 2556124890

Diamond specifications and retailer prices

From $2,646 AUD
As of November 4, 2026
Save $2,362 AUD (47%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: $6,992 AUD at NZ Jewellers · As of September 30, 2026
View at NZ Jewellers

About this 1.23ct natural radiant diamond

This 1.23ct natural radiant sits in the classic one-carat band, graded J colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 2556124890. Listed at 12 retailers as of November 4, 2026, with a 89% 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
SI1
Clarity
Ideal
Cut (retailer stated)

Specifications

Cut (retailer stated)Ideal
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 2556124890
Dimensions6.82 × 5.25 × 3.70 mm
L/W Ratio1.30
Culet sizeNone
Key to symbols
Crystal, Cloud, Feather, Needle, Extra Facet
Top View
6.82 mm5.25 mm1.23 ctJ / SI1
OriginNatural
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 2556124890
Side View
Table 68.0%CrownGirdlePavilionCulet: NoneDepth 70.4%

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: $3,499 AUD|Low: $2,425 AUD|High: $5,082 AUD|Avg: $3,394 AUD|+2.7%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
November 5, 2026
Retailer 6$2,646 AUD
Retailer 5$2,758 AUD
Retailer 8$2,867 AUD
Retailer 9$2,867 AUD
Retailer 2$3,113 AUD
Retailer 1$3,499 AUD
Retailer 7$3,740 AUD
Retailer 4$3,898 AUD
Retailer 3$5,008 AUD

44 data points across 9 retailers

12 retailers$2,646 AUD to $5,008 AUD

A
Cheapest Retailer
-
$2,646 AUD
Final sale: no returns
A
Retailer 2
-
$2,758 AUD
View
Retailer 3
-
$2,867 AUD
View
Price last confirmed 30 days ago
Retailer 4
-
$2,867 AUD
View
Price last confirmed 30 days ago
Retailer 5
-
$3,000 AUD
View
Price last confirmed 38 days ago
B+
Retailer 6
-
$3,113 AUD
View
Retailer 7
-
$3,308 AUD
View
Price last confirmed 39 days ago
B+
Retailer 8
-
$3,499 AUD
View
Retailer 9
-
$3,740 AUD
View
Price last confirmed 33 days ago
B
Retailer 10
-
$3,898 AUD
View
B
Retailer 11
-
$5,008 AUD
View
Most Expensive
NZ Jewellers
052bd83d-df8d-4648-80e9-b4cec5a37c13 · Sep 30
$6,992 AUD
$4,804 USD
View
Price last confirmed 37 days ago
11 more retailers have this diamond
Prices start from $2,646 AUDSave up to $2,362 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 Radiant
$2,646 AUD