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Round|Natural|GIA

1.23ct G SI1 Round Natural Diamond

EX • G/SI1 • GIA 5506576801

Certificate GIA 5506576801

Diamond specifications and retailer prices

From $5,427 AUD
As of November 6, 2026
Save $6,095 AUD (53%) vs most expensive(unlock to see where)
7 retailers carry this diamond
Most expensive: $11,522 AUD at Diamond Quarter · As of November 5, 2026
View at Diamond Quarter

About this 1.23ct natural round diamond

This 1.23ct natural round sits in the classic one-carat band, graded G colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 5506576801. Listed at 7 retailers as of November 5, 2026, with prices from $5,427 to $11,522, a $6,095 spread on the same certified stone. Diamond Quarter lists it at $11,522. 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
G
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.5°
Pavilion angle41°
OriginNatural
Grading LabGIA
CertificateGIA 5506576801
Dimensions6.79 × 6.85 × 4.28 mm
L/W Ratio1.01
Star length50%
Lower girdle80%
Top View
6.79 mm6.85 mm1.23 ctG / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 5506576801
Side View
Table 57.0%Crown 35.5°Girdle: MED-STKPavilion 41°Culet: NoneDepth 62.8%

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 6
Current: $6,954 AUD|Low: $4,737 AUD|High: $11,300 AUD|Avg: $8,030 AUD|+2.1%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
November 5, 2026
Retailer 3$5,986 AUD
Retailer 4$6,068 AUD
Retailer 1$6,954 AUD
Retailer 2$10,301 AUD
Retailer 5$11,300 AUD

20 data points across 5 retailers

7 retailers$5,427 AUD to $11,522 AUD

B+
Cheapest Retailer
-
$5,427 AUD
B+
Retailer 2
-
$5,986 AUD
View
Final sale: no returns
B+
Retailer 3
-
$6,068 AUD
View
B+
Retailer 4
-
$6,954 AUD
View
B
Retailer 5
-
$10,301 AUD
View
B
Retailer 6
-
$11,300 AUD
View
Most Expensive
B
Diamond Quarter
1.23SI1G5501E3A1N · Nov 5
$11,522 AUD
£6,234 GBP
View
6 more retailers have this diamond
Prices start from $5,427 AUDSave up to $6,095 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
$5,427 AUD