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Marquise|Natural|GIA

1.20ct J SI1 Marquise Natural Diamond

ID • J/SI1 • GIA 7551009950

Certificate GIA 7551009950

Diamond specifications and retailer prices

From $5,158 AUD
$3,615 USD
As of November 2, 2026
Save $5,664 AUD (52%) vs most expensive(unlock to see where)
18 retailers carry this diamond
Most expensive: $10,822 AUD at MOH London · As of November 1, 2026
View at MOH London

About this 1.2ct natural marquise diamond

This 1.2ct 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 7551009950. Listed at 18 retailers as of November 1, 2026, with prices from $5,158 to $10,822, a $5,664 spread on the same certified stone. MOH London lists it at $10,822. 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

1.20
Carat
J
Colour
SI1
Clarity
Ideal
Cut (retailer stated)

Specifications

Cut (retailer stated)Ideal
PolishExcellent
SymmetryVery Good
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 7551009950
Dimensions10.45 × 5.51 × 3.48 mm
L/W Ratio1.90
Culet sizeNone
Key to symbols
Cloud, Crystal, Feather, Needle
Top View
10.45 mm5.51 mm1.20 ctJ / SI1
OriginNatural
CutIdeal
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateGIA 7551009950
Side View
Table 61.0%CrownGirdle: STK-VTKPavilionCulet: NoneDepth 63.1%

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 2
Current: $10,822 AUD|Low: $4,469 AUD|High: $10,953 AUD|Avg: $6,793 AUD|-0.1%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 3, 2026
Retailer 3$5,158 AUD
Retailer 2$5,363 AUD
Retailer 9$5,528 AUD
Retailer 10$6,156 AUD
Retailer 5$6,257 AUD
Retailer 11$6,445 AUD
Retailer 4$6,757 AUD
Retailer 8$6,850 AUD
Retailer 6$7,247 AUD
Retailer 7$8,353 AUD
MOH London$10,822 AUD

44 data points across 11 retailers

18 retailers$5,158 AUD to $10,822 AUD

B+
Cheapest Retailer
-
$5,158 AUD
$3,615 USD
B
Retailer 2
-
$5,309 AUD
$3,721 USD
View
B+
Retailer 3
-
$5,363 AUD
$3,758 USD
View
B
Retailer 4
-
$5,418 AUD
$3,797 USD
View
B
Retailer 5
-
$5,430 AUD
$3,805 USD
View
B
Retailer 6
-
$6,125 AUD
$4,293 USD
View
Retailer 7
-
$6,156 AUD
$4,314 USD
View
Price last confirmed 9 days ago
B
Retailer 8
-
$6,257 AUD
$4,385 USD
View
B
Retailer 9
-
$6,342 AUD
View
Retailer 10
-
$6,425 AUD
$4,503 USD
View
Price last confirmed 11 days ago
B
Retailer 11
-
$6,445 AUD
$4,517 USD
View
B
Retailer 12
-
$6,757 AUD
£3,729 GBP
View
Retailer 13
-
$6,850 AUD
View
Price last confirmed 24 days ago
B
Retailer 14
-
$7,065 AUD
$4,951 USD
View
B
Retailer 15
-
$7,247 AUD
€4,837 EUR
View
B
Retailer 16
-
$8,353 AUD
ZAR 94,567 ZAR
View
B
Retailer 17
-
$9,832 AUD
$6,890 USD
View
Most Expensive
B
MOH London
CBFC25F1D · Nov 1
$10,822 AUD
£5,972 GBP
View
17 more retailers have this diamond
Prices start from $5,158 AUDSave up to $5,664 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+
1.20ct Marquise
$5,158 AUD