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Marquise|Natural|GIA

1.23ct J SI1 Marquise Natural Diamond

EX • J/SI1 • GIA 6243044009

Certificate GIA 6243044009

Diamond specifications and retailer prices

From $4,819 AUD
As of November 6, 2026
Save $5,342 AUD (53%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: $10,160 AUD at MOH London · As of November 7, 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 J colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 6243044009. Listed at 11 retailers as of November 6, 2026, with prices from $4,819 to $10,160, a $5,342 spread on the same certified stone. MOH London lists it at $10,160. 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
J
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 6243044009
Dimensions10.73 × 5.65 × 3.58 mm
L/W Ratio1.90
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Twinning Wisp, Feather, Crystal
Top View
10.73 mm5.65 mm1.23 ctJ / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6243044009
Side View
Table 60.0%CrownGirdle: STK-THKPavilionCulet: NoneDepth 63.4%

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: $10,160 AUD|Low: $4,819 AUD|High: $10,338 AUD|Avg: $6,723 AUD|-1.7%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
November 7, 2026
Retailer 3$4,819 AUD
Retailer 4$5,445 AUD
Retailer 8$5,577 AUD
Retailer 9$5,747 AUD
Retailer 7$6,385 AUD
Retailer 11$6,385 AUD
Retailer 5$6,559 AUD
Retailer 12$6,861 AUD
Retailer 6$7,236 AUD
Retailer 2$8,028 AUD
Retailer 10$9,364 AUD
MOH London$10,160 AUD

19 data points across 12 retailers

11 retailers$4,819 AUD to $10,160 AUD

B+
Cheapest Retailer
-
$4,819 AUD
B
Retailer 2
-
$5,445 AUD
View
B
Retailer 3
-
$5,577 AUD
View
B
Retailer 4
-
$5,747 AUD
View
B
Retailer 5
-
$6,385 AUD
View
B
Retailer 6
-
$6,385 AUD
View
B
Retailer 7
-
$6,559 AUD
View
B
Retailer 8
-
$7,236 AUD
View
B
Retailer 9
-
$8,028 AUD
View
B
Retailer 10
-
$9,364 AUD
View
Most Expensive
B
MOH London
81CE3D562 · Nov 7
$10,160 AUD
£5,497 GBP
View
10 more retailers have this diamond
Prices start from $4,819 AUDSave up to $5,342 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
$4,819 AUD