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Round|Natural|GIA

1.23ct E SI1 Round Natural Diamond

EX • E/SI1 • GIA 6345619250

Certificate GIA 6345619250

Diamond specifications and retailer prices

From $10,015 NZD
As of November 1, 2026
Save $6,931 NZD (41%) vs most expensive(unlock to see where)
8 retailers carry this diamond
Most expensive: $16,946 NZD at MOH London · As of November 4, 2026
View at MOH London

About this 1.23ct natural round diamond

This 1.23ct natural round sits in the classic one-carat band, graded E colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 6345619250. Listed at 8 retailers as of November 1, 2026, with prices from $10,015 to $16,946, a $6,931 spread on the same certified stone. MOH London lists it at $16,946. 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
E
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
Crown angle36°
Pavilion angle41°
OriginNatural
Grading LabGIA
CertificateGIA 6345619250
Dimensions6.86 × 6.81 × 4.26 mm
L/W Ratio1.01
Star length50%
Lower girdle75%
Top View
6.86 mm6.81 mm1.23 ctE / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 6345619250
Side View
Table 57.0%Crown 36°Girdle: ThickPavilion 41°Culet: NoneDepth 62.3%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 1
Current: $16,946 NZD|Low: $9,814 NZD|High: $17,197 NZD|Avg: $12,131 NZD|+2.2%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
November 5, 2026
Retailer 4$10,015 NZD
Retailer 8$10,058 NZD
Retailer 6$10,311 NZD
Retailer 9$11,035 NZD
Retailer 5$11,401 NZD
Retailer 7$11,533 NZD
Retailer 2$12,529 NZD
Retailer 10$13,497 NZD
Retailer 3$14,071 NZD
MOH London$16,946 NZD

37 data points across 10 retailers

8 retailers$10,015 NZD to $16,946 NZD

B+
Cheapest Retailer
-
$10,015 NZD
B+
Retailer 2
-
$10,058 NZD
View
B+
Retailer 3
-
$10,311 NZD
View
Retailer 4
-
$11,401 NZD
View
Price last confirmed 28 days ago
Retailer 5
-
$11,533 NZD
View
Price last confirmed 8 days ago
B
Retailer 6
-
$12,529 NZD
View
B
Retailer 7
-
$14,071 NZD
View
Most Expensive
B
MOH London
F721B937A · Nov 4
$16,946 NZD
£7,501 GBP
View
7 more retailers have this diamond
Prices start from $10,015 NZDSave up to $6,931 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.

B+
1.23ct Round
$10,015 NZD