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Marquise|Natural|GIA

1.23ct D SI1 Marquise Natural Diamond

EX • D/SI1 • GIA 6545405876

Certificate GIA 6545405876

Diamond specifications and retailer prices

From $9,414 AUD
As of November 6, 2026
Save $7,741 AUD (45%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: $17,155 AUD at MOH London · As of November 4, 2026
View at MOH London

About this 1.23ct natural marquise diamond

This 1.23ct natural marquise sits in the classic one-carat band, graded D colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 6545405876. Listed at 10 retailers as of November 4, 2026, with prices from $9,414 to $17,155, a $7,741 spread on the same certified stone. MOH London lists it at $17,155. 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
D
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
OriginNatural
Grading LabGIA
CertificateGIA 6545405876
Dimensions11.14 × 5.62 × 3.51 mm
L/W Ratio1.98
Top View
11.14 mm5.62 mm1.23 ctD / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 6545405876
Side View
Table 59.0%CrownGirdle: MED-THKPavilionCulet: NoneDepth 62.4%

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: $17,155 AUD|Low: $9,242 AUD|High: $17,870 AUD|Avg: $11,836 AUD|-4.0%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
November 7, 2026
Retailer 7$9,414 AUD
Retailer 8$9,757 AUD
Retailer 4$10,166 AUD
Retailer 5$10,204 AUD
Retailer 2$11,495 AUD
Retailer 6$11,883 AUD
Retailer 9$12,522 AUD
Retailer 3$13,430 AUD
MOH London$17,155 AUD

40 data points across 9 retailers

10 retailers$9,414 AUD to $17,155 AUD

B+
Cheapest Retailer
-
$9,414 AUD
B+
Retailer 2
-
$9,703 AUD
View
B+
Retailer 3
-
$9,757 AUD
View
B
Retailer 4
-
$10,166 AUD
View
Final sale: no returns
B
Retailer 5
-
$10,204 AUD
View
B
Retailer 6
-
$11,495 AUD
View
B
Retailer 7
-
$11,883 AUD
View
B
Retailer 8
-
$12,522 AUD
View
B
Retailer 9
-
$13,430 AUD
View
Most Expensive
B
MOH London
98A34FD36 · Nov 4
$17,155 AUD
£9,281 GBP
View
9 more retailers have this diamond
Prices start from $9,414 AUDSave up to $7,741 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 Marquise
$9,414 AUD