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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 $5,973 NZD
As of November 6, 2026
Save $6,655 NZD (53%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: $12,628 NZD 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 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 10 retailers as of November 4, 2026, with prices from $5,973 to $12,628, a $6,655 spread on the same certified stone. MOH London lists it at $12,628. 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: $12,628 NZD|Low: $5,973 NZD|High: $12,813 NZD|Avg: $8,319 NZD|-1.4%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 6, 2026
Retailer 11$5,973 NZD
Retailer 3$6,748 NZD
Retailer 5$6,913 NZD
Retailer 7$7,124 NZD
Retailer 4$7,914 NZD
Retailer 9$7,914 NZD
Retailer 6$8,130 NZD
Retailer 10$8,504 NZD
Retailer 2$8,969 NZD
Retailer 8$11,606 NZD
MOH London$12,628 NZD

18 data points across 11 retailers

10 retailers$5,973 NZD to $12,628 NZD

B+
Cheapest Retailer
-
$5,973 NZD
B
Retailer 2
-
$6,748 NZD
View
B
Retailer 3
-
$6,913 NZD
View
B
Retailer 4
-
$7,124 NZD
View
B
Retailer 5
-
$7,914 NZD
View
B
Retailer 6
-
$7,914 NZD
View
B
Retailer 7
-
$8,130 NZD
View
B
Retailer 8
-
$8,969 NZD
View
B
Retailer 9
-
$11,606 NZD
View
Most Expensive
B
MOH London
81CE3D562 · Nov 4
$12,628 NZD
£5,512 GBP
View
9 more retailers have this diamond
Prices start from $5,973 NZDSave up to $6,655 NZD

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
$5,973 NZD