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1.23ct J SI2 Round Natural Diamond

EX • J/SI2 • IGI 628465258

Shape and cutting style on the report: Round brilliant

Certificate IGI 628465258

Diamond specifications and retailer prices

From $1,454 USD
As of November 6, 2026
Save $2,804 USD (66%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: $4,258 USD at NZ Jewellers · As of November 5, 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 628465258. Listed at 14 retailers as of November 5, 2026, with prices from $1,454 to $4,258, a $2,804 spread on the same certified stone. NZ Jewellers lists it at $4,258. 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
Color
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.6°
Pavilion angle41.1°
OriginNatural
Grading LabIGI
CertificateIGI 628465258
Dimensions6.90 × 6.84 × 4.27 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Cert comments
IDEAL CUT ROUND BRILLIANT
Top View
6.90 mm6.84 mm1.23 ctJ / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI 628465258
Side View
Table 57.0%Crown 35.6°Girdle: MED-STKPavilion 41.1°Culet: NoneDepth 62.2%

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 6
Current: $1,454 USD|Low: $1,454 USD|High: $3,611 USD|Avg: $2,167 USD|-2.9%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 6, 2026
Retailer 1$1,454 USD
Retailer 6$1,840 USD
Retailer 7$1,861 USD
Retailer 4$1,870 USD
Retailer 8$1,879 USD
Retailer 2$1,949 USD
Retailer 3$2,480 USD
Retailer 5$3,568 USD

37 data points across 8 retailers

14 retailers$1,454 USD to $4,258 USD

A
Cheapest Retailer
-
$1,454 USD
B+
Retailer 2
-
$1,840 USD
View
A
Retailer 3
-
$1,861 USD
View
A
Retailer 4
-
$1,870 USD
View
B+
Retailer 5
-
$1,879 USD
View
Final sale: no returns
A
Retailer 6
-
$1,949 USD
View
Retailer 7
-
$2,037 USD
View
Price last confirmed 8 days ago
B+
Retailer 8
-
$2,037 USD
View
B+
Retailer 9
-
$2,131 USD
View
B+
Retailer 10
-
$2,175 USD
View
B+
Retailer 11
-
$2,350 USD
View
B+
Retailer 12
-
$2,480 USD
View
B
Retailer 13
-
$3,568 USD
View
Most Expensive
B
NZ Jewellers
5ba006be-63d5-4d9e-a568-7e83ac34c81e · Nov 5
$4,258 USD
View
13 more retailers have this diamond
Prices start from $1,454 USDSave up to $2,804 USD

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
$1,454 USD