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Round|Natural|GIA

1.23ct I SI2 Round Natural Diamond

EX • I/SI2 • GIA 6552654575

Certificate GIA 6552654575

Diamond specifications and retailer prices

From $4,004 AUD
As of October 31, 2026
Save $1,563 AUD (28%) vs most expensive(unlock to see where)
5 retailers carry this diamond
Most expensive: $5,567 AUD at 77 Diamonds · As of November 1, 2026
View at 77 Diamonds

About this 1.23ct natural round diamond

This 1.23ct natural round sits in the classic one-carat band, graded I colour (near-colourless) and SI2 clarity (slightly-included), with a top-tier cut grade and certified by GIA 6552654575. Listed at 5 retailers as of October 31, 2026, with prices from $4,004 to $5,567, a $1,563 spread on the same certified stone. 77 Diamonds lists it at $5,567. 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
I
Colour
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36°
Pavilion angle40.8°
OriginNatural
Grading LabGIA
CertificateGIA 6552654575
Dimensions6.83 × 4.26 × 4.26 mm
L/W Ratio1.60
Culet sizeNone
Top View
6.83 mm4.26 mm1.23 ctI / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6552654575
Side View
Table 57.0%Crown 36°Girdle: MED-STKPavilion 40.8°Culet: NoneDepth 62.3%

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: Oct 31
Current: $5,567 AUD|Low: $3,288 AUD|High: $5,886 AUD|Avg: $4,477 AUD|+49.5%
77 Diamonds
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
November 1, 2026
Retailer 10$3,288 AUD
Retailer 9$3,371 AUD
Retailer 3$3,603 AUD
Retailer 11$3,910 AUD
Retailer 2$4,004 AUD
Retailer 8$4,506 AUD
Retailer 7$4,529 AUD
Retailer 4$4,541 AUD
Retailer 6$4,626 AUD
Retailer 5$5,507 AUD
77 Diamonds$5,567 AUD
Retailer 12$5,833 AUD

22 data points across 12 retailers

5 retailers$4,004 AUD to $5,567 AUD

A
Cheapest Retailer
-
$4,004 AUD
B+
Retailer 2
-
$4,302 AUD
$3,022 USD
View
B+
Retailer 3
-
$4,626 AUD
CA$4,514 CAD
View
B
Retailer 4
-
$5,507 AUD
€3,684 EUR
View
Most Expensive
B
77 Diamonds
RBMBE2RGKPUG · Nov 1
$5,567 AUD
£3,079 GBP
View
4 more retailers have this diamond
Prices start from $4,004 AUDSave up to $1,563 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.

A
1.23ct Round
$4,004 AUD