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Marquise|Natural|GIA

1.50ct I SI2 Marquise Natural Diamond

ID • I/SI2 • GIA 1555664423

Certificate GIA 1555664423

Diamond specifications and retailer prices

From $8,875 AUD
$6,220 USD
As of November 1, 2026
Save $7,657 AUD (46%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: $16,532 AUD at MOH London · As of November 2, 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 I colour (near-colourless) and SI2 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 1555664423. Listed at 14 retailers as of November 1, 2026, with prices from $8,875 to $16,532, a $7,657 spread on the same certified stone. MOH London lists it at $16,532. 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
I
Colour
SI2
Clarity
Ideal
Cut (retailer stated)

Specifications

Cut (retailer stated)Ideal
PolishVery Good
SymmetryVery Good
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 1555664423
Dimensions11.46 × 5.97 × 3.63 mm
L/W Ratio1.92
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Twinning Wisp, Natural
Top View
11.46 mm5.97 mm1.50 ctI / SI2
OriginNatural
CutIdeal
PolishVery Good
SymmetryVery Good
FluorescenceNone
CertificateGIA 1555664423
Side View
Table 60.0%CrownGirdle: STK-THKPavilionCulet: NDepth 60.8%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 1
Current: $16,532 AUD|Low: $9,736 AUD|High: $16,732 AUD|Avg: $11,699 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 6$9,736 AUD
Retailer 11$9,888 AUD
Retailer 9$10,284 AUD
Retailer 5$11,076 AUD
Retailer 7$11,213 AUD
Retailer 2$11,308 AUD
Retailer 10$11,471 AUD
Retailer 8$12,096 AUD
Retailer 3$12,371 AUD
Retailer 4$12,387 AUD
MOH London$16,532 AUD

41 data points across 11 retailers

14 retailers$8,875 AUD to $16,532 AUD

A
Cheapest Retailer
-
$8,875 AUD
$6,220 USD
B+
Retailer 2
-
$9,736 AUD
$6,823 USD
View
B+
Retailer 3
-
$9,888 AUD
CA$9,625 CAD
View
B+
Retailer 4
-
$10,284 AUD
$7,207 USD
View
B+
Retailer 5
-
$11,076 AUD
$7,762 USD
View
B+
Retailer 6
-
$11,213 AUD
$7,858 USD
View
B+
Retailer 7
-
$11,308 AUD
£6,240 GBP
View
B+
Retailer 8
-
$11,471 AUD
$8,039 USD
View
B
Retailer 9
-
$11,972 AUD
$8,390 USD
View
B
Retailer 10
-
$11,972 AUD
$8,390 USD
View
Retailer 11
-
$12,096 AUD
$8,477 USD
View
Price last confirmed 7 days ago
B
Retailer 12
-
$12,371 AUD
$8,670 USD
View
B
Retailer 13
-
$12,387 AUD
€8,268 EUR
View
Most Expensive
B
MOH London
D2AC85338 · Nov 2
$16,532 AUD
£9,123 GBP
View
13 more retailers have this diamond
Prices start from $8,875 AUDSave up to $7,657 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.

A
1.50ct Marquise
$8,875 AUD