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Marquise|Natural|GIA

1.50ct E SI1 Marquise Natural Diamond

EX • E/SI1 • GIA 6551670301

Certificate GIA 6551670301

Diamond specifications and retailer prices

From $16,231 AUD
CA$15,835 CAD
As of October 30, 2026
Save $8,932 AUD (35%) vs most expensive(unlock to see where)
9 retailers carry this diamond
Most expensive: $25,163 AUD at MOH London · As of November 1, 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 E colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 6551670301. Listed at 9 retailers as of October 30, 2026, with prices from $16,231 to $25,163, a $8,932 spread on the same certified stone. MOH London lists it at $25,163. 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
E
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 6551670301
Dimensions11.43 × 5.89 × 3.77 mm
L/W Ratio1.94
Top View
11.43 mm5.89 mm1.50 ctE / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateGIA 6551670301
Side View
Table 60.0%CrownGirdle: THN-XTKPavilionCulet: NoneDepth 64.0%

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: Oct 30
Current: $25,163 AUD|Low: $13,647 AUD|High: $25,163 AUD|Avg: $17,459 AUD|+12.8%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
November 1, 2026
Retailer 9$13,728 AUD
Retailer 10$15,864 AUD
Retailer 4$16,231 AUD
Retailer 2$17,280 AUD
Retailer 6$17,890 AUD
Retailer 5$19,133 AUD
Retailer 8$19,955 AUD
Retailer 3$20,301 AUD
Retailer 7$21,195 AUD
MOH London$25,163 AUD

24 data points across 10 retailers

9 retailers$16,231 AUD to $25,163 AUD

Retailer 1
-
$15,864 AUD
Price last confirmed 28 days ago
B+
Retailer 2
-
$16,231 AUD
CA$15,835 CAD
View
B+
Retailer 3
-
$17,280 AUD
£9,558 GBP
View
B+
Retailer 4
-
$17,890 AUD
$12,567 USD
View
B+
Retailer 5
-
$19,075 AUD
$13,399 USD
View
B+
Retailer 6
-
$19,133 AUD
$13,440 USD
View
B
Retailer 7
-
$19,955 AUD
$14,017 USD
View
B
Retailer 8
-
$20,301 AUD
€13,581 EUR
View
Most Expensive
B
MOH London
0F8B4BE1C · Nov 1
$25,163 AUD
£13,918 GBP
View
8 more retailers have this diamond
Prices start from $16,231 AUDSave up to $8,932 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
$16,231 AUD