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Round|Natural|GIA

1.23ct J SI2 Round Natural Diamond

EX • J/SI2 • GIA 6555394646

Certificate GIA 6555394646

Diamond specifications and retailer prices

From $3,878 NZD
As of November 5, 2026
Save $307 NZD (7%) vs most expensive(unlock to see where)
7 retailers carry this diamond
Most expensive: $8,365 NZD at NZ Jewellers · As of October 23, 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 GIA 6555394646. Listed at 7 retailers as of November 5, 2026, with a relatively tight 8% spread, which is unusual at this carat range and suggests competitive pricing across the listings. 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 angle35.5°
Pavilion angle40.8°
OriginNatural
Grading LabGIA
CertificateGIA 6555394646
Dimensions6.80 × 6.84 × 4.28 mm
L/W Ratio1.01
Girdle conditionSlightly Thick
Key to symbols
Twinning Wisp, Crystal, Needle
Top View
6.80 mm6.84 mm1.23 ctJ / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6555394646
Side View
Table 56.0%Crown 35.5°GirdlePavilion 40.8°Culet: NoneDepth 62.7%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 5
Current: $8,365 NZD|Low: $3,848 NZD|High: $8,570 NZD|Avg: $5,320 NZD|-2.4%
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 6, 2026
Retailer 3$3,869 NZD
Retailer 4$3,878 NZD
Retailer 5$3,922 NZD
Retailer 6$4,032 NZD
Retailer 2$4,185 NZD
Retailer 8$6,622 NZD
Retailer 7$7,098 NZD
NZ Jewellers$8,365 NZD

14 data points across 8 retailers

7 retailers$3,878 NZD to $4,185 NZD

Retailer 1
-
$3,869 NZD
Price last confirmed 9 days ago
A
Retailer 2
-
$3,878 NZD
View
Retailer 3
-
$3,922 NZD
View
Price last confirmed 8 days ago
Retailer 4
-
$4,032 NZD
View
Price last confirmed 17 days ago
B+
Retailer 5
-
$4,185 NZD
View
Retailer 6
-
$7,098 NZD
View
Price last confirmed 18 days ago
Most Expensive
NZ Jewellers
a1599ef9-aea0-4bf8-9ab8-51d6dd714bff · Oct 23
$8,365 NZD
$4,637 USD
View
Price last confirmed 14 days ago
6 more retailers have this diamond
Prices start from $3,878 NZDSave up to $307 NZD

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
$3,878 NZD