Round|Natural|GIA

1.23ct E SI1 Round Natural Diamond

EX • E/SI1 • GIA 1565135099

Certificate GIA 1565135099

Diamond specifications and retailer prices

From $5,528 AUD
As of November 5, 2026
Save $927 AUD (14%) vs most expensive(unlock to see where)
9 retailers carry this diamond
Most expensive: $9,974 AUD at NZ Jewellers · As of October 27, 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 E colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 1565135099. Listed at 9 retailers as of October 30, 2026, with a relatively tight 17% 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
E
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceMedium
Crown angle36°
Pavilion angle41°
OriginNatural
Grading LabGIA
CertificateGIA 1565135099
Dimensions6.78 × 6.83 × 4.24 mm
L/W Ratio1.01
Girdle conditionSlightly Thick
Key to symbols
Crystal, Feather
Top View
6.78 mm6.83 mm1.23 ctE / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceMedium
CertificateGIA 1565135099
Side View
Table 59.0%Crown 36°GirdlePavilion 41°CuletDepth 62.3%

Caratlytics Score

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

Price History

Last verified: Nov 5
Current: $9,974 AUD|Low: $5,457 AUD|High: $10,022 AUD|Avg: $6,779 AUD|-0.5%
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
October 30, 2026
Retailer 4$5,457 AUD
Retailer 9$5,528 AUD
Retailer 3$5,538 AUD
Retailer 6$5,725 AUD
Retailer 7$5,725 AUD
Retailer 8$6,138 AUD
Retailer 2$6,455 AUD
Retailer 5$9,585 AUD
NZ Jewellers$9,974 AUD

28 data points across 9 retailers

9 retailers$5,528 AUD to $6,455 AUD

Retailer 1
-
$5,457 AUD
Price last confirmed 9 days ago
B+
Retailer 2
-
$5,528 AUD
View
Retailer 3
-
$5,538 AUD
View
Price last confirmed 9 days ago
Retailer 4
-
$5,725 AUD
View
Price last confirmed 11 days ago
Retailer 5
-
$5,725 AUD
View
Price last confirmed 12 days ago
Retailer 6
-
$6,138 AUD
View
Price last confirmed 33 days ago
B+
Retailer 7
-
$6,455 AUD
View
Retailer 8
-
$9,585 AUD
View
Price last confirmed 11 days ago
Most Expensive
NZ Jewellers
f2159c02-59d5-4fbc-86aa-12c7fd592421 · Oct 27
$9,974 AUD
$6,982 USD
View
Price last confirmed 10 days ago
8 more retailers have this diamond
Prices start from $5,528 AUDSave up to $927 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.

B+
1.23ct Round
$5,528 AUD