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Marquise|Natural|GIA

1.50ct J SI1 Marquise Natural Diamond

EX • J/SI1 • GIA 1555018794

Certificate GIA 1555018794

Diamond specifications and retailer prices

From $10,825 AUD
As of November 5, 2026
Save $4,021 AUD (27%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: $19,578 AUD at MOH London · As of October 8, 2026
View at MOH London

About this 1.5ct natural marquise diamond

This 1.5ct natural marquise sits in the one-and-a-half to two 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 1555018794. Listed at 14 retailers as of November 5, 2026, with a 37% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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

1.50
Carat
J
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishVery Good
SymmetryVery Good
FluorescenceNone
Crown angle35.86°
Pavilion angle38.01°
OriginNatural
Grading LabGIA
CertificateGIA 1555018794
Dimensions11.54 × 6.02 × 3.54 mm
L/W Ratio1.92
Girdle conditionVery Thick
Key to symbols
Feather, Twinning Wisp, Cloud
Top View
11.54 mm6.02 mm1.50 ctJ / SI1
OriginNatural
CutExcellent
PolishVery Good
SymmetryVery Good
FluorescenceNone
CertificateGIA 1555018794
Side View
Table 60.0%Crown 35.86°Girdle: THK-VTKPavilion 38.01°Culet: NoneDepth 58.9%

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 5
Current: $19,578 AUD|Low: $10,144 AUD|High: $19,578 AUD|Avg: $13,611 AUD
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
November 6, 2026
Retailer 13$10,897 AUD
Retailer 7$11,159 AUD
Retailer 4$11,432 AUD
Retailer 11$11,735 AUD
Retailer 3$12,401 AUD
Retailer 12$12,909 AUD
Retailer 6$13,662 AUD
Retailer 8$14,098 AUD
Retailer 2$14,374 AUD
Retailer 5$14,847 AUD
Retailer 9$15,322 AUD
Retailer 10$16,590 AUD
MOH London$19,578 AUD

41 data points across 13 retailers

14 retailers$10,825 AUD to $14,847 AUD

B+
Cheapest Retailer
-
$10,825 AUD
B
Retailer 2
-
$11,159 AUD
View
Final sale: no returns
B
Retailer 3
-
$11,204 AUD
View
B
Retailer 4
-
$11,432 AUD
View
Retailer 5
-
$11,639 AUD
View
Price last confirmed 30 days ago
B
Retailer 6
-
$12,909 AUD
View
B
Retailer 7
-
$13,371 AUD
View
B
Retailer 8
-
$13,662 AUD
View
B
Retailer 9
-
$14,098 AUD
View
B
Retailer 10
-
$14,374 AUD
View
Retailer 11
-
$14,548 AUD
View
Price last confirmed 62 days ago
B
Retailer 12
-
$14,847 AUD
View
Retailer 13
-
$15,322 AUD
View
Price last confirmed 30 days ago
Most Expensive
MOH London
452DDEF94 · Oct 8
$19,578 AUD
£10,592 GBP
View
Price last confirmed 29 days ago
13 more retailers have this diamond
Prices start from $10,825 AUDSave up to $4,021 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+
1.50ct Marquise
$10,825 AUD